Solve 66:

66. 56 tuning forks are arranged in a series that each fork gives 4 beats per second with previous one. The frequency of last fork is 3 times that of first. Then frequency of first fork is. 
(a) 52 Hz               (b) 56 Hz
(c) 60 Hz               (d) 110 Hz


 

Dear Student ,
Here is a link which will help you to solve this question with proper explanation .
https://www.meritnation.com/ask-answer/question/a-set-of-24-forks-is-arranged-in-a-series-of-increasing-freq/waves/7084053

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