wave_mechanics Beats Question 37
Question: A tuning fork gives 4 beats with 50 cm length of a sonometer wire. If the length of the wire is shortened by 1 cm, the number of beats is still the same. The frequency of the fork is
[MP PMT 2001]
Options:
A) 396
B) 400
C) 404
D) 384
Show Answer
Answer:
Correct Answer: A
Solution:
$ n\propto \frac{1}{l} $
Therefore $ n _{1}l _{1}=n _{2}l _{2} $
Therefore $ (n+4)49=(n-4)50\Rightarrow n=396 $
BETA
