1.

Waves `y_(1) = Acos(0.5pix - 100pit)` and `y_(2)=Acos(0.46pix - 92pit)` are travelling along x-axis. (Here `x` is in `m` and `t` is in second) (1) Find the number of times intensity is maximum in time interval of `1 sec`.A. 4B. 6C. 8D. 10

Answer» Correct Answer - A
Number of maxima in `1 s` is called the beat frequency.
Hence,
`f_(b) = f_(1) -f_(2)`
=`(100 pi)/(2 pi) -(92 pi)/(2 pi) = 4 Hz`.


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