Ten tuning forks are arranged in increasing order of frequency in… - Vidyadip

MCQ

Ten tuning forks are arranged in increasing order of frequency in such a way that any two consecutive tuning forks produce $4$ beats per second. The highest frequency is twice that of the lowest. Possible highest and lowest frequencies (in $Hz$ ) are ................

A
$80$ and $404$
B
$100$ and $50$
C
$44$ and $22$
✓
$72$ and $36$

✓

Answer

Correct option: D.

$72$ and $36$

d
(d)

Let frequencies be $f_1, f_2 \ldots f_{10}$ -

So, $f_{10}=f_1+9 \times$ (number of beats)

$f_{10}=f_1+36$

Hence, answer must be $(d)$.

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