Đố vui 2: What metal that was discovered end the primitive period?

DT

Đỗ Thành Trung

14 tháng 11 2021 - olm

#Lịch sử lớp 6

2

LN

〖 Lil Nấm ⁀ᶦᵈᵒᶫᶫ〗 ²ᵏ⁶ッ

14 tháng 11 2021

TL

Đố vui 2: What metal that was discovered end the primitive period?

- Copper and brass

HT

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DT

Đỗ Thành Trung

14 tháng 11 2021

right but u miss 1 more metal

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KS

Kudo Shinichi

2 tháng 7 2017 - olm

At the beginning of the summer, Bob was 140 cm tall. At the end of the summer, he measured his height again and discovered that it had increased by 5%. Measured in cm, what was his height at the end of summer ?

#Toán lớp 5

0

ND

naruto dragon goku

14 tháng 2 2017 - olm

\At the beginning of the summer, Bob was 140 cm tall. At the end of the summer, he measured his height again and discovered that it had increased by 5%. Measured in cm, what was his height at the end of summer?

#Toán lớp 5

0

LQ

Lê Quỳnh Anh

7 tháng 1 2018

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

What is the best title for the passage?

A. The history of the photoﬂash

B. Theories about how the eye reacts to light

C. The technology of modern photography

D. The dangers of using the early photoﬂash

#Mẫu giáo

1

DH

Dương Hoàn Anh

7 tháng 1 2018

Đáp án A

Chủ đề về INVENTIONS

Tiêu đề chính của đoạn văn là gì?

A. Lịch sử của đèn nháy (đèn ﬂash)

B. Các học thuyết về cách mà mắt phản ứng lại ánh sáng

C. Công nghệ chụp ảnh hiện đại

D. Những nguy hiểm của việc sử dụng đèn ﬂash thủa ban đầu

Căn cứ vào các thông tin ở cả đoạn 1 và 2:

- “Photoﬂash is now generated electronically, but the earliest form, first used in 1864, was a paper bag containing magnesium wire and some oxygen-rich substance, such as potassium chlorate." (Đèn flash ngày nay được tạo ra hàng công nghệ tự động hóa, nhưng thủa sơ khai, khi lần đầu tiên được sử dụng vào năm 1864, nó chỉ là một túi giấy có chứa dây dẫn magiê và một số chất giàu oxy, như kali clorat.)

- “The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's." (Sự phát triển của đèn flash diễn ra chậm, các bóng đèn nháy, chứa dây dẫn làm bằng kim loại, như magiê hoặc nhóm, có khả năng bị đốt cháy trong môi trường chứa oxy tinh khiết ở áp suất thấp, chỉ được phát minh vào những năm 1920.)

Như vậy có thể thấy xuyên suốt bài đọc là lịch sử ra đời và phát triển của đèn ﬂash => Do do, đáp án là A

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LQ

Lê Quỳnh Anh

23 tháng 8 2019

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

According to the passage, what helps a ﬂashbulb burn longer?

A. thicker wire

B. more oxygen

C. thinner glass

D. continuous electricity

#Mẫu giáo

1

DH

Dương Hoàn Anh

23 tháng 8 2019

Đáp án A

Theo bài văn, điều gì giúp cho bóng đèn flash có thể cháy lâu hơn?

A. dây dẫn dày hơn B. nhiều Oxy hơn

C. kính mỏng hơn D. điện thường xuyên

Căn cứ vào câu cuối của bài:

“A slightly bigger form of the metal will burn for a longer time.” (Một mẫu kim loại lớn hơn chút xíu sẽ cháy lâu hơn).

Trong suốt bài đọc, kim loại chính là dây dẫn trong bóng đèn flash.

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A

Akira

17 tháng 7 2018 - olm

Có ai giỏi về đố vui TA ? TL hộ vài bài.

1. What do you call a fish that only cares about himsel?

2. What is the word that everybody always says wrong?

3. What has a neck but no head?

#Tiếng anh lớp 6

3

CC

Cá Chép Nhỏ

17 tháng 7 2018

1. What do you call a fish that only cares about himself?

It's ''selfish''.

2. What is the word that everybody always says wrong?

It's the word ''WRONG''.

3. What has a neck but no head?

It's a bottle.

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NP

Nguyên Phạm Hoàng Lê

17 tháng 7 2018

1.selfish.

2.wrong.

3.bottle

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TV

Trần Vũ Như Bình

31 tháng 3 2022

The history of what we call cinema today began in the early 19th century. At that time, scientists discovered that when a sequence of still pictures was set in motion, they could give the feeling of movement. In the first two decades of its existence, the cinema developed rapidly. In those early days, films were little more than moving photographs, usually about one minute in length. By 1905, however, films were about five or ten minutes long. They used changes of scene and camera positions to...

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#Tiếng anh lớp 10

1

CM

Cô Mai Dung

1 tháng 4 2022

A Brief of Cinema (Tóm tắt về điện ảnh)

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NP

Nguyễn Phương Thảo

17 tháng 8 2016 - olm

Sean caught a prize fish last weekend. He was going to measure it but realized that his ruler was not long enough. He was able to measure the head and discovered that it was 9cm long, he then measured the tail and found that it was the length of the head plus half the length of the body. If the body was the length of the head plus the tail, what is the total length of the fish?
Kết quả là 72cm phải ko các bạn

#Toán lớp 5

2

NP

Nguyễn Phương Hiền Thảo

17 tháng 8 2016

dịch ra là thế này :

Sean bắt một con cá giải thưởng vào cuối tuần qua. Ông đã đi để đo lường nó nhưng nhận ra rằng người cai trị của ông là không đủ dài. Ông đã có thể đo đầu và phát hiện ra rằng nó là 9cm dài, sau đó ông đã đo đuôi và thấy rằng nó là chiều dài của đầu cộng với một nửa chiều dài của cơ thể. Nếu cơ thể là chiều dài của đầu cộng với đuôi, tổng chiều dài của cá là gì?

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NP

Nguyễn Phương Thảo

17 tháng 8 2016

ko phải người cai trị mà là cái thước kẻ của ông là ko đủ dài

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LQ

Lê Quỳnh Anh

23 tháng 11 2019

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

The word "it" in paragraph 2 refers to _____.

A. oxygen

B. battery

C. wire

D. current

#Mẫu giáo

1

DH

Dương Hoàn Anh

23 tháng 11 2019

Đáp án C

Từ "it” trong đoạn 2 đề cập đến

A. khí Oxy B. Pin C. dây dẫn D. dòng điện

Căn cứ vào thông tin đoạn 2:

“The ﬂash was fired by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it.” (Đèn ﬂash được đốt sáng bằng cách xuyên thủng bóng đèn và cho phép oxy tiếp xúc với kim loại, khiến nó tự bốc cháy. Sau đó, những bóng đèn thắp sáng bởi một pin điện, pin này làm nóng dây dẫn bằng cách truyền một dòng điện nhỏ qua nó - tức là dây dẫn.)

Các đáp án còn lại có xuất hiện trong bài nhưng không chính xác nên ta

=> Do đó, đáp án là C

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LQ

Lê Quỳnh Anh

24 tháng 1 2018

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

The word "momentarily" in paragraph 2 is closet in meaning to ______.

A. effortlessly

B. brieﬂy

C. electronically

D. gradually

#Mẫu giáo

1

DH

Dương Hoàn Anh

24 tháng 1 2018

Đáp án B

Từ “momentarily” trong đoạn 2 gần nghĩa với từ ___________.

A. effortlessly /'efətlisli/ (adv): một cách dễ dàng

B. brieﬂy /'bri:ﬂi/ (adv): một cách ngắn gọn

C. electronically /ilek'trɔnikli/ (adv): bằng điện tử

D. gradually /'grædjuəli/ (adv): dần dần, từ từ

Căn cứ vào ngữ cảnh đoạn 2:

“In each case, enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of Visible light.” (Trong mỗi trường hợp, một năng lượng vừa đủ được cung cấp để đốt cháy kim loại có thể oxy hóa trong giây lát để phát ra ánh sáng nóng trắng mà mắt thường có thể thấy được.)

=> Do đó, đáp án là B

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LQ

Lê Quỳnh Anh

20 tháng 10 2018

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

According to the passage, an advantage of using a photoﬂash is that it _____.

A. can produce repeated bursts of light

B. intensities colors in photographs

C. is short enough not to bother human eyes

D. supplements existing lighting

#Mẫu giáo

1

DH

Dương Hoàn Anh

20 tháng 10 2018

Đáp án D

Theo đoạn văn, một lợi ích của việc sử dụng đèn ﬂash là nó _______.

A. có thể tạo ra những chùm sáng lặp đi lặp lại

B. tăng cường màu sắc trong các bức ảnh

C. đủ nhanh để không làm nheo mắt người được chụp ảnh

D. bổ sung ánh sáng hiện có

Dựa vào thông tin trong đoạn 1:

Tạm dịch: “A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting." (Tuy nhiên, chất tráng phim dùng trong nhiếp ảnh - là một lớp phủ nhạy với ánh sáng trên phim ảnh, gidy hoặc thủy tinh - sẽ ghi lại những chùm ánh sáng ngắn hơn nhiều. Do đó, đèn flash chụp ảnh có thể được sử dụng để ghi lại chuyển động tốc độ cao trên phim cũng như điều chỉnh sự thiếu hụt của ánh sáng xung quanh)

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