Q. When a guitar string is sounded with a $440\ Hz$ tuning fork, a beat frequency of $5\ Hz$ is heard. If the experiment is repeated with a tuning fork of $437\ Hz$, the beat frequency is $8\ Hz$. The string frequency $(Hz)$ is
A) 445
B) 435
C) 429
D) 448
Explanation
(a) Frequency of string $= 440 \pm 5$
As frequency of tuning fork decreases beat frequency also increases, therefore, frequency of string $= 445\ Hz$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.