22. If a progressive wave travelling in positive x-direction having the amplitude of 6cm, frequency 200Hz
and velocity is 400m/s, then write the equation of that progressive wave.
Answers
Given info : If a progressive wave travelling in positive x-direction having the amplitude of 6cm, frequency 200Hz and velocity is 400m/s.
To find : write the equation of progressive wave.
solution : A progressive wave travelling in positive x - direction can be described as y = A sin(2πt/T - 2πx/λ)
here frequency = 200 Hz
so, Time period = 1/200 sec
velocity of wave, v = 400 m/s
so wavelength, λ = vT = 400 × 1/200 = 2 m
Amplitude, A = 6 cm = 0.06 m
Therefore the equation of wave is y = (0.06 m) sin(2πt/{1/200) - 2πx/2} ⇒y = 0.06 sinπ(400t - x)
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