A tuning fork sounded together with a tuning fork of frequency 25… - Vidyadip

MCQ

A tuning fork sounded together with a tuning fork of frequency $256$ emits two beats. On loading the tuning fork of frequency $256,$ the number of beats heard are $1$ per second. The frequency of tuning fork is

A
$257$
B
$258$
C
$256$
✓
$254$

✓

Answer

Correct option: D.

$254$

$n_1=$ Known frequency $=256, n_{=}=?$$x=2$ bps, which is decreasing after loading (i.e. $x \downarrow$ ) known tuning fork is loaded so $n \downarrow$
Hence $n\downarrow-n=x \downarrow$... (i)$n-n \downarrow=x \downarrow$Gorrect
${cnn}\downarrow=x \downarrow \quad \text {... (ii) }$
$\Rightarrow n_x=n_{-}x=256-2=254\mathrm{~Hz}$

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