A) two waves
B) three waves
C) four waves
D) five waves
Correct Answer: B
Solution :
\[y=4{{\cos }^{2}}(t/2)\sin (1000t)\] \[=2[2{{\cos }^{2}}(t/2)\sin (1000t)]\] \[=2(1+\cos t)\sin (1000t)\] \[=2\sin (1000t)+2\sin (1000t)\cos t\] \[=2\sin (1000t)+\sin (1001t)+\sin (999t)\] Thus, given wave represents the superposition of three waves.You need to login to perform this action.
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