Saturday, July 1, 2017

Interference occurs when right rays are [TRB Question]

One of the TRB question asked in the Polytechnic TRB exam 2012 for Mechanical Engineering is Interference occurs when right rays are. The answer for this question is provided here with supporting concept. We are the only one website to provide the TRB questions / answers with proof. There seems a lot of error in the competitive exam guides. So go for right solution in right time here.

Interference occurs when right rays are
A. Obtained from two different sources and their travel path lengths differ by odd number of half wavelengths
B. Obtained from a single source and their travel path lengths differ by odd number of half wavelengths
C. Obtained from a single source and their travel path lengths differ by even number of half wavelengths
B. Obtained from two different sources and their travel path lengths differ by even number of half wavelengths

Answer: B. Obtained from a single source and their travel path lengths differ by odd number of half wavelengths

Supporting Concept for this answer:
Read the RED underlinedin the following image:



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