Two waves of slightly different frequencies `f_(1) and f_(2) (f_(1) gt f_(2))` with zero phase difference , same amplitudes ,travelling in the same direction superimpose .A. Phenomenon of beats is always observed by human ear.B. Intensity of resultant wave is a constant.C. Intensity of resultant wave varies periodically with time with maximum intensity `4 a^(2)` and minimum intensity zero.D. A maxima appears at a time `1//[2 (f_(1) - f_(2))]` later ( or earlier ) than a minima appears .

Two waves of slightly different frequencies `f_(1) and f_(2) (f_(1) gt

1.	Two waves of slightly different frequencies `f_(1) and f_(2) (f_(1) gt f_(2))` with zero phase difference , same amplitudes ,travelling in the same direction superimpose .A. Phenomenon of beats is always observed by human ear.B. Intensity of resultant wave is a constant.C. Intensity of resultant wave varies periodically with time with maximum intensity `4 a^(2)` and minimum intensity zero.D. A maxima appears at a time `1//[2 (f_(1) - f_(2))]` later ( or earlier ) than a minima appears .
Answer» Correct Answer - C::D `t = 0 , (1)/((f_(1) - f_(2))) , (2)/((f_(1) - f_(2))) , (3)/((f_(1) - f_(2))) ,…..` are times at which maxima are obtained `t = (1/2)/((f_(1) - f_(2))) , (3/2)/((f_(1) - f_(2))) , (5/2)/((f_(1) - f_(2))) ,…` are times at whhich minima are obtained.

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