A tuning fork of unknown frequency produoes 4 beats per second wh… - Vidyadip

MCQ

A tuning fork of unknown frequency produoes $4$ beats per second when sounded with another tuning fork of frequency $254 \,Hz$. It gives the same number of beats per second when unknown tuning fork loaded with wax. The unknown frequency before loading with wax is ..........

✓
$258$
B
$254$
C
$250$
D
Can't be determined

✓

Answer

Correct option: A.

$258$

a
(a)

Since there are 4 beats. We know that the unknown frequency $(f)$.

$f=254+4$

Since in the second case after loading with wax frequency of $2^{\text {nd }}$ fork must have reduced. Initial frequency must be

$f=254+4=258 \,Hz$

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