A string of length fixed at both ends vibrates in its second harmonic at when under…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

A string of length

1.20\,\text{m}

fixed at both ends vibrates in its second harmonic at

300\,\text{Hz}

when under tension

T_1

. The tension is then increased by

50\%

. What will be the frequency of the third harmonic under the new tension? (a)

632\,\text{Hz}

(b)

675\,\text{Hz}

(c)

551\,\text{Hz}

(d)

450\,\text{Hz}