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Nội dung: <blockquote data-quote="Hân Nhi" data-source="post: 156071" data-attributes="member: 306052">Câu 1:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20v=\frac{N-1}{t}.\lambda%20=\frac{10-1}{18}.2=1m/s\Rightarrow%20B" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 2:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20f=\frac{v}{\lambda%20}=\frac{200}{4}=50\Rightarrow%20T=0,2\Rightarrow%20A" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 3:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\lambda%20=0,8m\Rightarrow%20v=\lambda%20.f=0,8.500=400m/s\Rightarrow%20D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 5:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20u1=8cos2\Pi%20(0,5\Pi%20x-4\Pi%20t)=8cos(\Pi%20^{2}x-8\Pi%20^{2}t)\Rightarrow%20\Pi%20^{2}x=\frac{2\Pi%20x}{\lambda%20}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?\150dpi%20\Rightarrow%20\lambda%20=\frac{2}{\Pi%20},\omega%20=8\Pi%20\Rightarrow%20f=4\Pi%20\Rightarrow%20v=\lambda%20.f=8\Rightarrow%20C" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 6:<img src="https://codecogs.izyba.com/png.latex?\150dpi%204=\frac{2\Pi%20}{\lambda%20}\Rightarrow%20\lambda%20=\frac{\Pi%20}{2},%20f=\frac{10}{\Pi%20}\Rightarrow%20v=f.\lambda%20=5cm/s\Rightarrow%20D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 7:Vì ngược pha nên <img src="https://codecogs.izyba.com/png.latex?\150dpi%20d=(k+1/2)\lambda%20\Rightarrow%20\lambda%20=\frac{9}{k+1/2}\Rightarrow%20v=\frac{4,5}{k+1/2}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?\150dpi%201,5%3Cv%3C2,25\Leftrightarrow%201,5%3C\frac{4,5}{k+1/2}%3C2,25\Rightarrow%20k=2\Rightarrow%20v=1,8=%3EA" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 8: giống câu 7 áh, giải ra ta dc k=1=>v=2=>ACâu 9:tượng tự luôn, k=2=>v=0,8=>BCâu 10:<img src="https://codecogs.izyba.com/png.latex?\150dpi%206\lambda%20=3\Rightarrow%20\lambda%20=0,5cm\Rightarrow%20v=50cm/s\Rightarrow%20B" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 11:<img src="https://codecogs.izyba.com/png.latex?\150dpi%200,02\Pi%20=\frac{2\Pi%20}{\lambda}%20\Rightarrow%20\lambda=100cm,%20f=2=%3Ev=2.100=200cm/s=%3E%20C" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 12: nhân 2pi vào, ta thấy:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\lambda%20=50cm=%3EB" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 13: <img src="https://codecogs.izyba.com/png.latex?\150dpi%20\frac{-\Pi%20}{4}=\frac{-2\Pi%20}{\lambda%20}\Rightarrow%20\lambda%20=8\Rightarrow%20v=8\Rightarrow%20A" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 14:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20u=5cos(\omega%20t\pm%20\frac{2\Pi%20}{\lambda%20})=5cos(\omega%20t\pm%20\frac{2\Pi%20.5,4}{0,8})=5cos(\omega%20t\pm%2013,5\Pi%20)\Rightarrow%20C" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 15:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20u=acos(2\Pi%20ft=acos(2\Pi%20f%20t-\frac{2\Pi%20d}{\lambda%20})=acos2\Pi%20(ft-\frac{d}{\lambda%20})\Rightarrow%20A" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 16:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\lambda%20=v/f=8\Rightarrow%20u=acos(\Pi%20t+\frac{\Pi%20}{3}-\frac{2\Pi%20d}{\lambda%20})=acos(\Pi%20t+\frac{2\Pi%20}{15})\Rightarrow%20C" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 17:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\lambda%20=v/f=0,4\Rightarrow%20\varphi%20=\frac{-2\Pi%20d}{\lambda%20}=-\Pi%20=%3E%20C" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 18:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20a=1,5cos(\Pi%20t-\frac{2\Pi%20.1,5}{6})=1,5cos(\Pi%20t-\frac{\Pi%20}{2})=%3EC" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 19:<img src="https://codecogs.izyba.com/png.latex?\150dpi%203s-15m\Leftrightarrow%20T=1,2s=%3E\lambda%20=6\Rightarrow%20a=2cos(\frac{5\Pi%20t}{3}-\frac{\Pi%20}{2}-\frac{2\Pi%20.2,5}{\lambda%20})=2cos(\frac{5\Pi.t%20}{3}-\frac{4\Pi%20}{3})=%3ED" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 20:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\frac{\Pi%20}{4}=\frac{2\Pi%20.1}{\lambda%20}\Rightarrow%20\lambda%20=8\Rightarrow%20v=f.\lambda%20=8.2,5=20\Rightarrow%20D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 21:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\Delta%20\varphi%20=\frac{2\Pi%20\Delta%20d}{\lambda%20}=\frac{2\Pi%20.6}{0,04.200}=1,5\Pi%20\Rightarrow%20A" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 22;<img src="https://codecogs.izyba.com/png.latex?\150dpi%20d=\lambda%20/2=0,2.10/2=1=%3EA" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 23:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\Delta%20\varphi%20=\frac{2\Pi%20.2,5}{400/80}=\Pi%20\Rightarrow%20C" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 24:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20d=\lambda%20/2=2.1/2=1=%3EB" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 25:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20d=\lambda%20/2=40=%3E%20\lambda%20=80cm=%3E%20f=v/\lambda%20=2,5=%3ED" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 26:tương tự câu 25 nha => f=50=>DCâu 27:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20d=\lambda%20=2.1=2=%3EC" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 28:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\Delta%20\varphi%20=\frac{2\Pi%20(d2-d1)}{\lambda%20}\Leftrightarrow%20\frac{\Pi%20}{3}=\frac{2\Pi%20\(d2-d1)}{300/500}=%3Ed2-d1=0,1m\Leftrightarrow%20d2-0,4=0,1=%3E%20d2=0,5=%3EB" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 29:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\lambda%20=0,5/0,5=1\Rightarrow%20d1=\lambda%20=1,%20d2=\lambda%20/2=0,5=%3EB" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 30;<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\Delta%20\varphi%20=\frac{2\Pi%20d}{\lambda%20}\Leftrightarrow%20(n+0,5)=\frac{2d}{\lambda%20}\Rightarrow%20\lambda%20=\frac{0,8}{n+0,5}\Rightarrow%20f=v/\lambda%20=5(n+0,5)\Rightarrow%208%3C5(n+0,5)%3C13\Rightarrow%20n=2=%3Ef=12,5=%3ED" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 31:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20d=\lambda%20/4=10.0,2/4=0,5=%3ED" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />câu 32:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\lambda%20=0,5/2=0,25\Rightarrow%20dM=\lambda%20=0,25,%20dN=\lambda%20/2=0,125=%3EA" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Câu 33:<img src="https://codecogs.izyba.com/png.latex?\150dpi%20\Delta%20d%20=\lambda%20.\frac{(2k+1)\frac{\Pi%20}{2}}{2\Pi%20}=\lambda%20.\frac{2k+1}{4}=12,5\Rightarrow%20f=v/\lambda%20=2,4(2k+1)\Rightarrow%2010%3C2,4(2k+1)%3C15=%3E%20k=2=%3E%20f=12=%3EB" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></blockquote>

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