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
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$n_A =$ Known frequency $f_B = 256 \text{ Hz}, n_B =$ ?
$x = 2 bps$ , which is decreasing after loading (i.e. $x \downarrow$ )
Known tuning fork is loaded so $n_{A} \downarrow$
Hence $n_{A} \downarrow - n_{B} = X \downarrow$ ..... (i) Correct
$n_{B} - n_{A} = X \downarrow ...$ . (ii) Wrong
$\Rightarrow n_{B} = n_{A} - x = 256 - 2 = 254$ Hz
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