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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Oscillations
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4 waves $\;x_{1}=4 sin5t\;, x_{2}= 8 sin 5t\;, x_{3}=cos 5t \;and\;x_{4}=4 cos 5t \;$ interfere and if the final equation can be written in the form of $\;A sin (5t+sin^{-1}(\large\frac{B}{c}))\;$ , what is the sum of $\;A+B+C$ ?

$(a)\;31\qquad(b)\;25\qquad(c)\;30\qquad(d)\;26$

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Answer : (d) 26
The final wave is
$x_{1}+x_{2}+x_{3}+x_{4}=12 sin 5t+ 5 cos 5t$
$=13\;(\large\frac{12}{13} sint 5t+ \large\frac{5}{13} cos 5t)$
$=13\;sin(5t+sin^{-1}(\large\frac{5}{13}))$
$A=13\;,B=5\;,c=13$
$A+B+C=31\;.$
answered Mar 7, 2014 by yamini.v
 

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