Wave Motion 1 Question 11

11. A transverse sinusoidal wave of amplitude a, wavelength λ and frequency f is travelling on a stretched string. The maximum speed of any point on the string is v/10, where v is the speed of propagation of the wave. If a=103m and v=10m/s, then λ and f are given by

(1998,2M)

(a) λ=2π×102m

(b) λ=103m

(c) f=1032πHz

(d) f=104Hz

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Answer:

Correct Answer: 11. (a, c)

Solution:

  1. Maximum speed of any point on the string =aω=a(2πf)

=v10=1010=1 (Given, v=10m/s ) 2πaf=1f=12πaa=103mf=12π×103=1032πHz

Speed of wave v=fλ

(10m/s)=(1032πs1)λ

λλ=2π×102m



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