Two waves of nearly equal frequencies and travel simultaneously through air

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

Problem

Two waves of nearly equal frequencies

f_1

and

f_2

travel simultaneously through air. The number of beats produced per second is (a)

2\,|f_1-f_2|

(b)

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

(c)

|f_1-f_2|

(d)

\dfrac{3}{2}\,|f_1-f_2|