Q. 12

# The displacement A. It represents a progressive wave of frequency 60Hz.

B. It represents a stationary wave of frequency 60Hz.

C. It is the result of superposition of two waves of wavelength 3 m, frequency 60Hz each travelling with a speed of 180 m/s in opposite direction.

D. Amplitude of this wave is constant.

Answer :

C. It is the result of superposition of two waves of wavelength 3 m, frequency 60Hz each travelling with a

Speed of 180 m/s in opposite direction.

Explanation: As the equation involves harmonic functions and separately, it represents a stationary wave.

The given equation is: ------------------- (i)

Which is travelling along positive x-axis and is superimposed by the reflected wave

Also, is a stationary wave travelling in opposite direction

------------------------ (ii)

By comparing equations (i) and (ii),

Also,

Or,

Frequency

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