Trên mặt nước, hai nguồn kết hợp A, B cách nhau 40cm luôn dao động cùng pha, có bước sóng 6cm. Hai điểm CD nằm trên mặt nước mà ABCD là một hình chữ nhât, AD=30cm. Số điểm cực đại và đứng yên trên đoạn CD lần lượt là :
A.5 và 6.
B.7 và 6.
C.11 và 12.
D.10 và 11.
P là điểm bất kỳ trên DC khi đó vị trí của P so với hai nguồn thỏa mãn:
\(AD\leq d_1 \leq AC \Rightarrow -AC \leq -d_1\leq -AC\\ BC\leq d_2 \leq BD \\\) \(\Rightarrow BC-AC \leq d_2-d_1\leq AC-AD\)![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAwAAAAJmCAIAAABkOXAqAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAACsQSURBVHhe7d2xdhtJejZgOVkzmeNxYk9mHV/Ans3WoUKFEyqUjxOFEzpTqEtgqEuYkJcxl7GhQ4X79496C1tAo0GABIgu1PMEOuyvqrurm4XCKwAk3/0dAGAwAhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCAAYjgAEAAxHAAIAhiMAAQDDEYAAgOEIQADAcAQgAGA4AhAAMBwBCIb29PT04cOH7xvv379/15g2p2L6AdwXAQiG9i//8i/JO4c8PDzIQMBdEoBgXI+Pj0k6y6YMlN4Ad0QAgnHtvef16dOnHz9+lKZv376l+u7d9HUpAtwNAQjG9fXr12ScdweWgt9++600eREIuD8CEAytRJxJths/fvxI26FWgK5Z12BoCTgLESdtAhBwd6xrMLQEnIWI8/DwUFp9DAi4MwIQDK3km0m2d/kYEHCvBCAYWsk3k2zv8jEg4F5Z1GBoSTfL+SbNAhBwXyxqMLSkGwEIGIxFDYaWdLOQb56entIsAAH3xaIGQ0u6OZRvvn///vPPP6dZAALui0UNhpZ08+7d09PT3l/GaH358iU7ANwFAQiGloBzlPQD3B8BiHU5+DrEVPn+/Xt6cFG5xQvaP48KcE8EINZl6V0Yv4jvSnJ/Ky/2AIMQgFiRp6en//zP/8xT8cyUjR4fH9OVC8nN9RlnYDBWPVbkl19+mZ6J917s2f41huLr169p4BL8tS9gTAIQK1KeiSfZ3vjx48fnz5/TsCEDXZC/9gWMSQBiRcoz8STbjSkGffz4Mc1erric9q99+aQ5B00Tw48mcH8EIFYkK+vC51HaDOTligvavgvmrrLn+G+HMmHomgDEimRZXf5A7pSBts/WXgS6lOlOllvqR8BoTemn/VXgcyYMXROAWJEsq0d/IslnVuAN7KUfvxGK+yMAsSJZa48GIC8CwRsoP5JZeKWHuyQAsSJZbo8GoIkXgeDaykNsIv1wrwQgViQr7nMBqP3BpZSAi8oDzEOM+2VysyJZcU9Yc9PP6gzXkQeYhxj3y+RmRbLiCkBwa3mAeYhxv0xuViQr7tE1d+8Xk6QKXFQeYB5i3C+TmxXJint0zW1/OOXTp0+pAheVx5gAxP0yuVmRrLgLa+7e7+P3i0ngevIwE4C4XyY3K7L9BT9l8/iv4S99gGvIw8wDjftlcrMi5W8y/PTTT2XlPcLvJoGr8utGuXsCEGtx/PWewtte8DbaXzfqr75zlwQg1mIp/XixB95e+zdnpi8eHx/TAPdCAGIttn+T3Ms8sAbbh2Qx/RelfSmovGS7V4SOCEAAHLaXgQ568Cf56JMABMCiHz9+fP78OWHnEG9S0ykBCIBnLL0UJP3QLwEIABiOAAQADEcAAgCGIwABAMMRgACA4QhAAMBwBCAAYDgCEAAwHAEIABiOAAQADEcAojP5DfzA7eTRCD0zj+lMFmDgdvJohJ6Zx3QmCzBwO3k0Qs/MYzqTBRi4nTwaoWfmMZ3JAgzcTh6N0DPzmM5kAT5BdmAjN2VBOsFpD7F0hZ6Zx3QmC/DJstvYci+OSlcGlqlwguwAPTOP6UwW4Opgca50G1NuwQmyA0PKJDhN9oGemcd0JgtwlepGSgvSaVS5Cxt7m63SmaHke7/gYJ9ShK6Zx3QmC3CVaiMNC9JpPLn+5g5keybNDCDf8gXptJFSlSr0zDymM1mAq1R3pW1Z+rF8r9LMGPJdb6ShSrVKFXpmHtOZLMBVqoekx7L0G15ux660MYZ81zdS2pW2KlXomXlMZ7IAV6kuS79l6Te23ItGGhjDs9/00mErVeiZeUxnsgBXqT4nvQ9Jj+HldlSpchde/w0ts2IrVeiZeUxnsgBXqZ4m++xKGxvuyZ0p39BJtl8qR6lShZ6Zx3QmC3CV6jmy50ZKcHcyxatUXypHqVKFnpnHdCYLcJXq+V65O3ShzPNJtl8qR6lShZ6Zx3QmC3CVKhvTDXl6evrw4cP//u//vt/4/v172hjVRR4p5SBbqULPzGM6kwW4SvU6co5+lvsMt/Hw8JC2C5mOma/oRJkJ2XipcpCtVKFn5jGdyQJcpXodOUeV6oploI0vX76k7UJyXE+Bg8l3vUoVemYe05kswFWq15FzNNKwVhlldfH0M8mhN1Lidt7su1C+41upQs/MYzqTBbhK9QpygkPSY30eHh4yxOukn0mOXqXKm8s3QACClzKP6UwW4CrVK8gJFqTTynz79q0M723ST5E23krue5XqleVkVarQM/OYzmQBrlK9mpxmJs3jyfU30sD15Y7vStuV5WRVqtAz85jOZAGuUr2ynKyRhiHlFlSpck2518vS72pymipV6Jl5TGeyAFepvomc0uq/+11IiWvKvT4kPa4sJ6tShZ6Zx3QmC3CV6hs6ftKbDOkmxrnSlfj/031XGt5ETlmlCj0zj+lMFuAq1dXIsDxDcGmZWBspvaGcuEoVemYe05kswFWqq5FhValewVUPzjrd8Ju+mc7/kCr0zDymM1mAq1RXI8PalbbLyXHX/Ty08uFxljLftlKFnpnHdCYLcJXqamRYh6THJeSIVaors+axrc3671UZ4Vaq0DPzmM5kAa5SXY0Ma1n6vUIO1EjDymRwniyPyj3aSGmVMsQqVeiZeUxnsgBXqa5MBndIerxUjtJIw/pkfFWqVLkvjTSsUoZYpQo9M4/pTBbgKtVVyhB3pe2lcpRGGtYn42ukYXi5HYekx/pkfFWq0DPzmM5kAa5SXauMspGGF8khGmlYn4xvJs2jyl1Yln7rk/FVqULPzGM6kwW4SnXdMtaNlM6X/RtpWKuMcibN48n1L0intcooq1ShZ+YxnckCXKXag+MDfvZayu6tNKzS09PT+/fvM9BD0m8wufhdaVu3jLVKFXpmHtOZLMBVqv3L9SxcUdoaaVirf//3f89AF6TfeHL9Gyn1ICOuUoWemcd0JgtwlWr/cj1VqhspNdKwYj/99FPGuiD9Zkrr+/fvHx8fU7ov5QKz0Y8y7K1UoWfmMZ3JAlyl2r9cz66lplJfswy0GWq2q1Rn0rzx7du3VLm1fEuqVKFn5jGdyQJcpdq/XM8JssO6Zayz0aZ6WgB6eHhItRNl2Nm4L+XStlKFnpnHdCYLcJVq/3I9z0nv1ctwDw14qV5MTT9+/Ch9Jt+/f09Do/2E9fTFwT5vrAymSOm+5NqqVKFn5jGdyQJcpXovclXL0m/1MtyFAaftkC9fvkwdHh4eyubBF4F++eWX0lr86U9/+vDhQxuDSkLay0YHi6+XQTTScF9ybVWq0DPzmM5kAa5SvS+5tmXpt2IZ6PJQ0zxTWr99+5btQ0dIQ/XP//zP078lKu39+H0pTolnXny9HG4mzfcl11alCj0zj+lMFuAq1buTy1uWfmuVUR4dZ3rM7LWWzckUbsorPWl4926q/Pzzz9nYvB2WrxoHizniS+Uoy9LvjuTCqlShZ+YxnckCXKV6d3J5z0nv9dm+h5XtZaXbEelX3/n605/+VOqTvffCTpcjvlSOckh63J1cXpUq9Mw8pjNZgKtU70uu7QTZYX3++7//O0M8ZO+DOKkuSKdzbsuXL1+2Caz49OlT+9nqHPEVcqBGGu5ULrJKFXpmHnPA3gcpJnvPWDeUAVWpXsj2TZZs30IurLFUn5SmFTr4xlOr/SBOSgvSadZtSjn5alfp/Ntvv2V7oxSzcYn7lgNtpHTXcqlVqtAz85gDDj57Xeqjo6+U0VSpXkh5S+WGV1ouak/aNlKqUl2f9lPMS9J14aq30mnWbUqr+WpX6dy+3jMpxWxc6L5d6jhdKPdtK1XomXnMAUvPXmm+qQylSvVCctDbXWlO30jDriNN61cGP8n2biVfzcyb2o8/b5Wfoi9S2rz/tVcpm5wuN65KFXpmHvO8rHnrWPUylCrVC8lBb3SlOXcjDed75e5XVcY2yfasko0XKUcoUtr8ZsW9yvH3OkufbLBR7slWqtAz85jnZc1bx6qXoVSpXkgOeosrzYl3pe182X8jpdXIsJqBZftQ5Vl7nwTK/hspHTpsefVo/l5nad1KFXeGe2Qe87yseZv/Nx/5cOvbfFA6J6tSvZAc9Bbre07cSMOL5BCNNKxABtQMKdu7g0zpOW3P7VtdRaqHTrSVhoXTpY3Z/UkVemYec8xe4jnrR3uuJGeqUr2QHPQW63tOXKX6UjnKTJpvKkNpBpPt3eGldNTe383YvtVVbOvZnh2z7J6NQ8peTHJHqlShZ+Yxx7S/aG767/Upv3cue15NTlOleiE56K3X99cPoFzFknS6kQyiGUa2mz99uvQTXq3t553LZ/bbjz8X8/o2Ep0ouzGbUalCz8xjFn39+jWr3ez3yJXN9NtIw/VXxpymSvVCctC7WN9zJcvS72qOv2E6Sb/ncsnUIV/NlN1fKcfalTaq3JcqVeiZecwBe09dz/4U8ePjYxquvzLmNFWqF5KD3tH6nutZkE7X8ewbpul39JcGbV+/yfZMaX2lHGsjJXbl7lSpQs/MY/ZN6af9DSsfP34sL/YcSTnbt8b2PoV6DeVEW6leSA56d+t7rmpBOl3a8d+FuPeO1cHOe31SnUnz61zqOPeq3OqtVKFn5jH79v7jvn2r60jKKfVJ+75Y+zLS9MWlfkCsHHAr1QvJQe9xfc+FLUinHmTEjTQsO7EbR5R7uJUq9Mw8Zt/e/8W3wSXbs5+1maRhd1nc+8T0pX5ALIerUr2QHPR+1/dc3kyaO5FBV6kuSKf7/Z6+jdzEKlXomXnMYdvPpW6DS9mclM1WGnabUqrmP6TzMjlcleqLzF+jKl9P0uNO5SKrVLuSoW+kNJPmKlVeJDexShV6Zh5zWPs6UKlk49Dal4amacoWKdViSRslZ7Sbj4+PpcOJctAq1ReZzp6jbLQ/i5Qed633Kz1x/KXbJNu8SG5ilSr0zDxmUZa6uthl49Dal4amqX3/a69SXlJqO3z9+rX0OUX2qVI9R/vCz5J0vY6c48pnYevmd3uackf+9FgXyj3cShV6Zh6zKEtdXeyycWjtS0PTlO2FH2NuXx8qvn37Vro9KztUqZ5j78NJB6XrFeQEVaor1ss4j7vtJZQpd6mPwd3EZhb8Q6rQM/OYRVnq6mKXjUNrXxqapmwfqkzmEeT054bsUKV6juy5669//Wu+2kjXK8gJGmlYq4xyI6VOrGfA5e5Nst2hXECVKvTMPGZRlrq62GXj0NqXhqbpn/7pn/YqZXPP58+f89XuX1qdvlh6v6B02Er1HNnztAu5rBy9kYYVy0AbaViB44NZz2jLSCbZ7lAuoEoVemYej+7IpxOy1NXFLhuH1r40NE3ZrpX5e15F23PvZaGHh4fjoypSPUf2PO1CLiiHbqRhxTLQQ9LjRjKIo8NIjxXc54yj+aUS3ckFVKlCz8zj0S19OqGNLKWSjUNrXxqapmzXysGP3ZSPB2XjkIPvi6WtSvUc2fO0C7mgHLqRhhXLQJel3xvKiatUD0mPKtVbyAh6/hhQLqBKFXpmHo8u69lsRWsjS6lk49Dal4amKduzfVtLTfOfwG+loUr1HNlztu88880decHsuBy3kYYeZMQL0un6cr5daTskPRppeHM5/UZKvcnoq1ShZ+bx6LKezVa0VA/9GFfZbKWhacp2rWSjMf8Dq8Xey0KlTysNVarnyJ67+07Jpv0LaEsRZ+kFs+PKMVtp6EqGviCdrianWZBOjTTMpPlt5dwbKfUmo69ShZ6Zx6PLetY85U9RoP01OaU4yfahcJCG5c7ZaGz/nka2N0plku1D62waqlTPkT2bj1rvpZ/JwYjz4j96n30aaehNRr8gna4gJzgkPQ5Jj5k0v6GceCOl3mT0VarQM/N4dNMzfVnRtk/5e5/XKcVJ27PNQAffOdo7bPm6VbpNsr2RUlOcv9+UhirVc2zHdtzeefdCUqonyA6NNHQrlzGT5ivICXal7TnpvSttb6Wdcin1JqOvUoWemcej2/vTp3vaP+DV9iyxZrIUC9rOU5LIV430axbW9lwpbWzPVaRapXqOI5c8jWH7XLV33qVceFx6N9LQv1zPrrRdWo7eSMNpsk8jDW/lt99+y4nP+Z2fq5LRV6lCz8xjDr8isv2MTuv0tDRpk0T5opVOzcKa7Y2UqlQ3UqpSPd/8Wsr423rpOWnf/CrS8Jz0bqThXuSqqlQvLUffSOlM2blK9a38+PEjJ54F615k9FWq0DPzmANRYEo/28/o7Gn/L9vaSz+T42kpnZqFNdsbKVWpbqRUpXpRZeTlivY+EbVVeh6Xro003J1c3jUv8PUHLyMsUnpD7X8DUupKhl6lCj0zjznPFIzaX99czNNPcSQDpcfCc2dKVaobKVWpXsf8w9Fb6fGc9N5I6X4dv8YjrZvb8xb3p5xoku1rWorOk/TYNe+//ZD+GmRMVarQM/OY62oz0H/913+VL9rAVCqTbG+ktLH3ZlyqVarXsfeENA07X5183vTeSGlIuQUbKW2ktJHS9b3BuY5E50k6NZb6Pyz8PvS3lwFVqULPzGNubPvWQLY3tsWPHz/uvRlX6lupXsc2vW0TW9mclM1TnNv/PpSrPkv27N/x9DOZ5lW6Vgd/VXqxks8MZTRVqtAz85gbaz9ws1U+afTrr7/OP4q0WX7/IdW3krN6AjhNbtbJstvtXGQMbZo5+GLnPNOkoenfvnRaKreVoVSpQs/MYzqTBbhK9a3krJ4AzpFbdoLscDsXGUY5yGQv1qe6kVKV6m49pXVMtgylShV6Zh7TmSzAVapvJWf1BHC+3LgF6XRrGc1GSmd6Wv6LcqluLP16z2xvpLSOm5OhVKlCz8xjOpMFuEr10uY/krNnVT+hs3K5ZSfIDreTcVSpnqN9/yulKtWNvXfBUt0NRimtI21kKFWq0DPzmM5kAa5SvbTj6adYyadT1yx36hzZ80YyiEYaTpbdZu9/TdJQ/fHHH2nY/a2hKTX9s31TGUqVKvTMPKYzWYCrVC+t/QjqkvkzHFu5Ry+SQ7y5nH4mzafJPof2SkP166+/puHQzxtOSmWS7ZvKUKpUoWfmMZ3JAlylymrkG7Ms/TZS2pW2G8kgdqXtBNvXct6/f//4+Jjq3//+/ehfxDsondYxyTOUKlXomXlMZ7IAV6ne1HpGclvlPhyRfjNprlK9nYxjJs1HLf2tmIOyzyFtYErppjKUKlXomXlMZ7IAV6neVIYy/LNC7sIh6XFUum6kdDsZx0yalx38WzGtLyf8PvG9P76b6k1lKFWq0DPzmM5kAa5SvZ2Mo0p1VLkLjTScLLut7zu7leajDsag7d8Yzvbsh+GLvV8kvZKPmmU0VarQM/OYzmQBrlK9kQyikYZR5S5spPQir9z9UsqFzKX5pQ7+zFexl37mvwn9VjKgKlXomXlMZ7IAV6neSAbRSMPALngTyi2dZPtGMohGGl7q4M98FUt/RuPmMqYqVeiZeUxnsgBXqd5CRtBIw117+8tcw43dfHv/IdVLaz/6s6r0M8mwqlShZ+YxnckCXKX65nL6XWm7U7nI9V3m2wypXPsk25fWvvn16dOnVFejDGwrVeiZeUxnsgBXqb65nL6RhnuUK6xSXYeMaSOlq7nqWdo3v45/9GeKSh8+fHjjv8SSkVWpQs/MYzqTBbhK9W3l3I003J1c3q60rUPG1EhDV6ZMk9GfbP4B6qvKWatUoWfmMZ3JAlyl+uZy+irV+5Jrm0nzCmRAh6RHJ07523Nz2flN5JRVqtAz85jOZAGuUr2FjOCunwxyhbvStgIZ0LL0eysvPuMpf3tuzxt/SjpnrVKFnpnHdCYLcJXqjdx8ANdWbvJWqiuTwS1Lv+t749O9pXJpW6lCz8xjOpMFuEqVq+nlPpdxHpF+15Qz3eO0zIVVqULPzGM6kwW4ShU2Mi2Wpd915BxVqnchl1SlCj0zj+lMFuAqVc53xzewXNoR6XdROfSutPUv11OlCj0zj+lMFuAqVc6U23fXNzBXuCz9LiQHnUlz53IxVarQM/OYzmQBrlLlZLlxjTTcqVzkIelxOTnuTJp7liupUoWemcd0JgtwlSonyC2bSfNdy6U20nAFOcFMmvuUa6hShZ6Zx3QmC3CV6tW8wSneQLlXR6TfvcvVbqR0HTnHTJo7lAuoUoWemcd0JgtwlerVvM1ZrqpcwpJ0GsnbXHg5y1yae5PRV6lCz8xjOpMFuEr1OnKOjZQ6lAuYSTNXkxu9K229yeirVKFn5jGdyQJcpXoFOUEjDR3KBVSpsuyCN6ocaivV3mT0VarQM/OYzmQBrlK9gpygkYY+3cElvKVyu4qUXiEH2kipNxl9lSr0zDymM1mAq1QvLUdvpIEx5LveSMNL5SgCEKyGeUxnsgBXqV5UDt1IA2PId/2Q9HiR1x/hhsrgt1KFnpnHdCYLcJXqReXQjTSsz8qH16lyV49Iv/O9Zt/bKhe+lSr0zDymM1mAq1QvJ8dtpGFlMrgqVS4nd3YmzYPJxVepQs/MYzqTBbhK9UJy0EYa1iQjm0kzF5Wb20jD6+RYM2len4yvShV6Zh7TmSzAVaoXkoM20rAOGdOCdOIKcosvepNzxJk0r0wGV6UKPTOP6UwW4CrVC8lBq1RXIANaln5c08Xvc/nezaV5TTKyKlXomXlMZ7IAV6leTo67miU+o1mWfqzAy74d5fu4J22rkWFVqULPzGM6kwW4SvVyctwVLPEZx7L0YzXyjTn/W5PdGmlYjQyrShV6Zh7TmSzAVaoXdaXDnq5c2hHpx8rk21OleprsU6W6GhlWlSr0zDymM1mAq1TvS67tkPRglfJN2pW2E2SHjZRWI8OqUoWemcd0JgtwlerdyeU10sBa5fu0IJ2ek94CEFyfeUxnsgBXqd6jXKEnm37kG7Ys/Z5zes83U8a/lSr0zDymM1mAq1Tv0X1f3R0rM/OI9OtKhl6lCj0zj+lMFuAqVViZTNBl6XemF+/4SmXMW6lCz8xjOpMFuEq1K/2OnHOV7/UR6Xeyl+31euW8W6lCz8xjOpMFuEr1TC/e8ZXKmIuUGEC+5Yekx8my20ZKbyKnrFKFnpnHdCYLcJXqObLnTZ8/irQxhnzXd6XtOek9k+bry/mqVKFn5jGdyQJcpXqO7LmR0jXlTIekByPJ975K9QTZYSbNV5aTValCz8xjOpMFuEr1ZNmtSvU6co5l6cd4XjYByl5zab6mnKlKFXpmHtOZLMBVqqfJPrvSdmk5+oJ0ggVHJkmZQnvSdjU5TZUq9Mw8pjNZgKtUT5N9Gmm4jpxjV9rgqEyXhQmTtpk0X0FOUKUKPTOP6UwW4CrV02SfKtVrypk2UoITZNJUqTbSsCttV5ATVKlCz8xjOpMFuEr1NNmnSvWa3uxE3Jkyc/akrUq1kYYryAmqVKFn5jGdyQJcpXqa7LOREqxSpukh6bGRUpXqFeQEVarQM/OYzmQBrlI9Tfa50PJ9qePAXJmoR6TfRkrXnJA5QZUq9Mw8pjNZgKtUT/OCXQ4qx5lkG64j82xZ+l1ubi8px99KFXpmHtOZLMBVqqd5wS57yhFaaYCryVQ7JD02UppJ8+vkWFWq0DPzmM5kAa5SPc25/VvldHNphivLhNuVtirVmTS/Qg5UpQo9M4/pTBbgKtVrypmWpR9cX+ZclequtM2k+UVyiCpV6Jl5TGeyAFepXkfOsSz94G1l/i3PwDTPpPl82b9KFXpmHtOZLMBVqjNpbqThNNlnWfrB7Ryfh2WizqX5TNm5ShV6Zh7TmSzAVaq70tZIwwmyw7L0g3XLfD0kPc6RPatUoWfmMZ3JAlyluittjTScIDsckh7Qg8zaBel0suxWpQo9M4/pTBbgKtVGGhppOE322ZU26Efm7mb25quZ0vMU2aFKFXpmHtOZLMBVqlWqjTScLLs10gA9yKxtLNWL0vqs9K5ShZ6Zx3QmC3CVapVqIw3nyJ5WebqVGbyR0qFHR5Hmo9K1ShV6Zh7TmSzAVaobKTXScKYX7wirMn8UlMpcmpelX5Uq9Mw8pjNZgKtUD63sadi1VIdxlAfIXJoPSY8qVeiZeUxnsgBXqR5a09NQpbqREowqj4SZNM+kuUoVemYe05kswNXB4qTUi5QaaYCB5cEwk+ZdaatShZ6Zx3QmC3A1r0xKz0m2D0kPGE8eA8vSr5GGKlXomXlMZ7IAV/PK5GBxz+ZgMK48Epal30ZKVarQM/OYzmQBXvZsn3IcYJJHxYJ0EoC4R+YxnckC/CI5BLArj5AF8w5lL+iaeUxnsgCfKTsDC/JQOU32gZ6Zx3QmC/A5sifwnDxmnpPe0DPzmM5kAT5N9gHOkcfPsvSDnpnHdCYL8HPSG3iRPJCOSlfokxlMZ7L0Lks/4HXyiDoqXaFDpi+dyboLrEAeltAh05fOZN0FViAPS+iQ6UtPsugCK5CHJfTJDKYbWXSBW8tjEnpmHtONLL3AreUxCT0zj+lGlt4qVQA4n2cRepLsI/0A8DqeSACA4QhAAMBwBCAAYDgCEAAwHAEIABiOAAQADEcAAgCGIwABAMMRgACA4QhAAMBwBCAAYDgCEAAwHAEIgAt4enr68OHD9+/fsw3rJgABcAG//PLLu3fvHh4esg3rJgABcAFT+imyDetmpgLwWk9PT4k/M+/fv/e+GCskALEWPkAA/ZpSTvLOId4XY4UEINbCBwigX9++fStZZ0n6wWqYlKzC3/72tyyTXjCHPuUB3GSd9nGdEqyGSckq/Pbbb1kmN7wOBN3Jo3eTdZ6ento3xf7yl7+UPrAeAhCrUN7/aqUB6EQeupsH794j+vfffy99YD08zXB77c+PPDw8lC++fv2aZqAH5ZE7eXx8zFcbHz9+TA9YEwGIG5vSz88//5yV8t279r2wP/74I524mvLDd//zP//jR/B4pTxuG58+fUobrI8AxI21L5V/+fLlx48f0zNx2fz111/Tiav5t3/7t3K3Jw8PD9P9TwOcKdOoYTqxZgIQt9S++TWln1L8448/UvJG2JXtvVXh/+u8zN5HnovtIxrWSQDiltqXf1La+Pz5c6oy0NVMNza3eOPjx4/H/7/+/fv3vSc5v7CAYv5DDEvMGdZDAOKWsijO/rM4PRNPz8dpe/fu27dvaeBC9tLPJA0L9l4r2vILC5hsf3bhFOYMKyEAcTPt+18pNdoMZMW8rHn6maRtwZH/4vs/Pc/+Gug9JgxrIABxM0vvf21NGSjNzz09c7o2/bQvs6V5QTpt3pHMV40poT4+PqYro8psWJ5L2xeK/JeGNfC8ws2UpXBy5MOS6SEAXcL//d//tb9loHzoZ/ucNCWb9Duk9JlMXy/9d//4Ebh7mQfLj9Z25qQEt2MWcjNZCI8uhdunZx8Deo0p+kzppP19S9uPPJ/4i5fSY/bN2gtDfnXTyDIJjj6i00MAYgXMQm7j+AeAtrZPz14zf7Hff/+9jT6TbfqZTF+c8ouXSodJthvtEXweaGSn/HeldJhkG27HLOQ2lj4AND19tj9r/R//8R/5yor5IlPQbNPPwYDS/uKllGbSvNChPYKoOqxT/rtSOkyyDbdjFnIbWQXfvfvpp5/y1XO8C/YC85/emjLQ/APLaXtpAJp8+fIlPTy3jerHCT+1kGaThBUwC7mNrIIn+POf/1y+mP5b6e2Vc23fldgz5ZW//e1v6XSJADRJD89tA8sMEIDogVnIDSz9Vr3i06dP20+oTKavt8/i3l45196HlJ+V3WbS/FYBqPxphfkbdkt1VmL7UM12Y+/d7VThdsxCbmC7Dp74x6faZ3HPfK8xpclff/01t/KovZCR6usCUIkv6bRr73Tbd+62kXdvX1F4habv0b/+67/mO3SUvzrHGghA3ED5ZXrTM3H7Ss9xXgS6oN9///0vf/lLuZ9HtLc6pdcFoCO/Tnpy8HSTUpnvW+qsx1K63bP3Ei/cikWE22g/gHKK9kWglLiQ6dkod3ZX+wsqU3pdAErzgu3pnppfkTCZKgffM917TWjvNSTe3rPvt4o+rIrnErqxfRHIj4NdXLmxk2zPpPlCASjbC/Ze7JmCzvYn+adn0PLFZP6akFcHgdMJQHSj/S0j/h95WeXGTrI9k+Z375b+5lf7sk1KM2l+LgClU9UGnaUXq7ZyiGoa1YcPH7wyBMwJQHRjevIrLwB8/vw5JS6kpIdJtme2L79NDr4C18aUlGbSfGYA2irvkWWj0RY3B/iHMiqvDAFzz6xEsDbnfniIU5T0MMn2zN7HO/Y+cNN+Rqf95NCebYo68mdT9z4A1CodstFoi6XPVqrL1wUMy7oAnBQUfjS/kGnJ8R9vbv/w6tIHueaf7Cm2R852tfeyUOmzlaoABMxYF4BTg8KzP+Zz/LNZU+vHjx9LzylLzT9OdOTln+2Rs72xfbUp2wIQcDLrAnBeUFiKQUfe/No65WWkYu8s2X83AKW08BOCp3wuGxiWdQF401dKnn0ZaVKy1DbWtO+stfkppYW/Q37K57KBYVkXgH+kimxf2Y8fPz5//lzOOLd9JanEmr3fGL7NT+0LTsdfWDrlpSlgNAIQkFTRdVBoP2HdOv65bGBYAhBwDw6+qjSln/bVI4AtAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAMRwACAIYjAAEAwxGAAIDhCEAAwHAEIABgOAIQADAcAQgAGI4ABAAM5u9//38QzsngmEQPPwAAAABJRU5ErkJggg==)
Tại điểm P bất kỳ, dao động cực đại khi : \(d_2-d_1=(k+\frac{\triangle\phi}{2\pi})\lambda\\ \)
dao động cực tiểu khi: \(d_2-d_1=(2k+1+\frac{\triangle\phi}{\pi})\frac{\lambda}{2}. \)
Số điểm dao động cực đại thỏa mãn: \(BC-AC\leq k\lambda \leq AD-AC \Rightarrow -3.33\leq k \leq 3.33 \Rightarrow k = -3;-2;-1;0;1;2;3.\)
Có 7 cực đại.
Số điểm dao động cực tiểu thỏa mãn:
\(BC-AC\leq (k+0.5)\lambda \leq AD-AC \Rightarrow -3.83\leq k \leq 2.83 \Rightarrow k = -3;-2;-1;0;1;2.\)
Có 6 cực tiểu.