Wave Motion 5 Question 21

21. A plane progressive wave of frequency 25Hz, amplitude 2.5×105m and initial phase zero propagates along the negative x-direction with a velocity of 300m/s. At any instant, the phase difference between the oscillations at two points 6m apart along the line of propagation is …… and the corresponding amplitude difference is …… m. (1997, 1M)

True / False

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Solution:

  1. v=300m/s,f=25Hz

Wavelength λ=vf=30025=12m

(a) Phase difference Δϕ=2πλ (path difference)

=2π12×6=π

(b) In plane progressive wave amplitude does not change.



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