JEE Main 2022 · 26 Jun · Shift 2 · Physics Q56

← JEE Main 2022 · 26 Jun · Shift 2

PhysicsInteger+4 / -1Question 56 of 90

A set of 20 tuning forks is arranged in a series of increasing frequencies. If each fork gives 4 beats with respect to the preceding fork and the frequency of the last fork is twice the frequency of the first, then the frequency of last fork is ______ Hz.

Your answer

Answer and worked solution

Official answer: 152

Arithmetic sequence. $f_{20}=f_1+19\times4=2f_1$ , so $f_1=76$ Hz and $f_{20}=152$ Hz.

Answer: 152

Topics:Beats

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JEE Main 2022 · 26 Jun · Shift 2, Physics question 56