Question

When a guitar string is sounded with a $440Hz$ tuning fork, a beat frequency of $5Hz$ is heard. If the experiment is repeated with a tuning fork of $437Hz$, the beat frequency is $8Hz$. The string frequency $(Hz)$ is

• A. 445
• B. 435
• C. 429
• D. 448

Answer 1

Answer: (A)

$\upsilon -5=440Hz$
$\upsilon -8=437Hz$
$\therefore \upsilon =445Hz$ by both the methods.
It could have been $435Hz$.
It would have satisfied $440-\upsilon =5$.
But this would not have satisfied $437Hz$.