Question

Two vibrating tuning forks produce progressive waves given by y1=4 sin 500 $\pi$t and y2 =2 sin 506 $\pi$t. Number of beats produced per minute is:

• A. 360
• B. 180
• C. 120
• D. 30

Answer 1

Answer: (B)

180

Answer 2

From the progressive wave equations provided,
where 1=500 and 2=506 and n1=250 and n2=253,
the beat frequency is given as n2n1=253-250=3 beats per second.
180 beats per minute is the number.

Therefore the correct option is (B): 180