Answer :

A. 3π B. 4π

C. zero, 40 mm


Wave speed = wave length × wave frequency



So, in 0.015 seconds, the path travelled by wave is,



Now, we know that, phase difference,


(A)


Now, given, path difference,


Putting in the equation, we get,


(B)


If two waves have same frequency and wavelength, the must have same amplitude too.


Using this concept, we get,




So,


Or,


So, final resulting amplitude is,



Now, putting the values of r, we get,


A=0 for


A=4 mm for (C)


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