JEE Main 2019PhysicsWaves and SoundEasyMCQ

JEE Main 2019 — Waves and Sound Question with Solution

JEE Main 2019 (08 Apr Shift 1)

Question

A wire of length 2L, is made by joining two wires A and B of same length but different radii r and 2r and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire A is p and that in B is q then ratio p:q is:

Choose an option

Show full solutionCorrect option: D
Correct answer
D1 :2

Step-by-step explanation

For rod A, f1=n12lTρA1
For rod B, f2=n22lTρA2
Given f1=f2
n12lTρA1=n22lTρA2      
n12lTρA1=n22lTρ(4A1)      ∵rB=2rAA2=4A1
n1=n22
n1n2=12

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About this question

This is a previous-year question from JEE Main 2019, covering the Waves and Sound chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.