Wave Motion 1 Question 12

12. A wave is represented by the equation;

y=Asin(10πx+15πt+π/3)

where, x is in metre and t is in second. The expression represents

(1990, 2M)

(a) a wave travelling in the positive x-direction with a velocity 1.5m/s

(b) a wave travelling in the negative x-direction with a velocity 1.5m/s

(c) a wave travelling in the negative x-direction with a wavelength 0.2m

(d) a wave travelling in the positive x-direction with a wavelength 0.2m

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Answer:

Correct Answer: 12. (a,b,c,d)

Solution:

  1. ω=15π,k=10π

Speed of wave, v=ωk=1.5m/s

Wavelength of wave λ=2πk=2π10π=0.2m

10πx and 15πt have the same sign. Therefore, wave is travelling in negative x-direction.

Correct options are (b) and (c).



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