Question

A particle having potential energy 1/3 of the maximum value at a distance of 4 cm from mean position. Amplitude of motion is ___________

(a) 4√3

(b) 6/√2

(c) 2/√6

(d) 2√6

This question was addressed to me during an interview.

Origin of the question is Wave Motion topic in section Waves of Engineering Physics I

Answer 1

Correct choice is (a) 4√3

The best I can explain: Ep=1/3 E

1/2 ky^2=1/3×1/2×kA^2

A=√3 y=√3×4=4√3 cm.