Q. Two sources produce sound waves of equal amplitudes and travelling along the same direction producing 18 beats in 3 seconds. If one source has a frequency of 341 Hz, the frequency of the other source may be
A) 329 or $353\ Hz$
B) 335 or $347\ Hz$
C) 338 or $344\ Hz$
D) 332 or $350\ Hz$
Explanation
(b) Beat frequency, $v = \frac{18}{3} = 6Hz$
Let $v_{2}$ be the frequency of other source
$\therefore v_{2} = v_{1} \pm v = (341 \pm 6)Hz = 347Hz$ or $335\ Hz$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.