Q12 of 36 Page 108

The displacement of a string is given by Where and are in m and t in s. The length of the string is 1.5m and its mass is.

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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