Two sine waves of slightly different frequencies \( f_{1} \) and \( f_{2} \) \( \left(f_{1}f_{2}...

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Two sine waves of slightly different frequencies \( f_{1} \) and \( f_{2} \) \( \left(f_{1}f_{2}\right) \) with zero phase difference, same amplitude, 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 \( \frac{1}{2\left(f_{1}-f_{2}\right)} \) later (or earlier) than a minima appears
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