A) 72 Hz
B) 288 Hz
C) 84 Hz
D) 87 Hz
Correct Answer: C
Solution :
According to the question frequencies of first and last tuning forks are 2n and n respectively. Hence frequency in given arrangement are as follows Þ 2n ? 24 ´ 3 = n Þ n= 72 Hz So, frequency of 21st tuning fork \[{{n}_{21}}=(2\times 72-20\times 3)=84Hz\]You need to login to perform this action.
You will be redirected in
3 sec