Tuning fork ${F_1}$ has a frequency of $256 Hz$ and it is observed to produce $6$ beats/second with another tuning fork ${F_2}$. When ${F_2}$ is loaded with wax, it still produces $6$ beats/second with ${F_1}$. The frequency of ${F_2}$ before loading was ..... $Hz$
Medium
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(b) $n_A$ = Known frequency $= 256 Hz, n_B = ?$
$x = 6\, bps$, which remains the same after loading.
Unknown tuning fork $F_2$ is loaded so $n_B\downarrow$
Hence $n_A -n_B\downarrow = x $... $(i)$ $\rightarrow$ Wrong
$n_B\downarrow -n_A = x$ ... $(ii)$ $\rightarrow$ Correct
==> $n-B = n_A + x = 256 + 6 = 262 Hz.$
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