JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 26 February 2021, Shift 2, Physics Q3

Question 3 of 90 in this shift, Physics question 3 of 30, Section A.

A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A ?

(1)335 HzOfficial answer
(2)338 Hz
(3)345 Hz
(4)342 Hz

Official answer

Option 1

NTA final key.

Chapter: Waves
Topic: Beats
Idea tested: Effect of Filing Fork

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.