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Physics of Sound

  1. The equation for a transverse wave travelling along the positive x-axis with amplitude 0.2 m, velocity v =360 ms–1 and wavelength λ = 60 m can be written as
    1. y - 0.2sin = 2π6t +
      x
      60
    2. y - 0.2sin = π6t +
      x
      60
    3. y - 0.2sin = 2π6t -
      x
      60
    4. y - 0.2sin 6t +
      x
      60
Correct Option: A

v = nλ

⇒ n -
v
-
360
- 6
λ60

a = 0.2
For a wave travelling along positive x-axis
y = a sin (ωt – kx)
= a sin2πnt -
2πx
λ

= a sinnt -
x
= 0.2 sin2π 6t -
x
λ60



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