A tuning fork A of frequency 200 Hz is sounded with fork B, the n… - Vidyadip

MCQ

A tuning fork $A$ of frequency $200 Hz$ is sounded with fork $B,$ the number of beats per second is $5.$ By putting some wax on $A,$ the number of beats increases to $8.$ The frequency of fork $B$ is .... $Hz$

A
$200$
B
$195$
C
$192$
✓
$205$

✓

Answer

Correct option: D.

$205$

d
(d) $n_A\downarrow -n_B = x\uparrow$ ... (i) $\rightarrow$ Wrong
$n_B -n_A\downarrow = x\uparrow$ ... (ii) $\rightarrow$ Correct
$\Rightarrow$ $n_B = n_A + x = 200 + 5 = 205 Hz.$

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