When two sound waves of close frequencies and interfere

PHYSICS · Single correct · CBSE · Physics · Waves · Waves

Problem

When two sound waves of close frequencies

f_1

and

f_2

interfere, the time interval

\Delta t

between successive amplitude maxima is (a)

\Bigl|\dfrac{1}{f_1}-\dfrac{1}{f_2}\Bigr|

(b)

\dfrac{1}{|f_1-f_2|}

(c)

\dfrac{2}{|f_1-f_2|}

(d)

\dfrac{1}{f_1+f_2}