On sounding tuning fork $A$ with another tuning fork $B$ of frequency $384 Hz, 6$ beats are produced per second. After loading the prongs of $A$ with some wax and then sounding it again with $B, 4$ beats are produced per second. What is the frequency of the tuning fork $A$ .... $Hz$
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(d) $n_A = ?, n_B = 384 Hz$
$x = 6\, bps$, which is decreasing (from $6$ to $4$) i.e. $x\downarrow$
Tuning fork $A$ is loaded so $ n_A\downarrow$
Hence $n_A\downarrow -n_B = x\downarrow$ .......$(i)$ $\rightarrow$Correct
$n_B -n_A\downarrow = x\downarrow$ ........$(ii)$ $\rightarrow$ Wrong
$x = 6\, bps$, which is decreasing (from $6$ to $4$) i.e. $x\downarrow$
Tuning fork $A$ is loaded so $ n_A\downarrow$
Hence $n_A\downarrow -n_B = x\downarrow$ .......$(i)$ $\rightarrow$Correct
$n_B -n_A\downarrow = x\downarrow$ ........$(ii)$ $\rightarrow$ Wrong
$ n_A = n_B + x = 384 + 6 = 390 Hz.$
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