Question

Fifty six tuning forks are arranged in a series such that each fork gives $6$ beats per second with the preceding one. Assuming the frequency of the last fork to be double of the first fork, the frequency of the last fork should be

• A. $220Hz$
• B. $330Hz$
• C. $440Hz$
• D. $660Hz$

Answer 1

Answer: (D)

$660Hz$

From question,
$n_1+55\times 6=n_2$
$\Rightarrow n+55\times 6=2n$
$\Rightarrow n=330Hz$
$\therefore n_2=2n$
$=2\times 330$
$=660Hz$.