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TNPSC Group 2 · 2012 Preliminary Examination

162.  A is the assertion and R is the reason. Examine these two statements carefully and select the answer using the code given below :
A : We are able to hear the sound behind the walls or obstacles
R : When the wavelength of a wave is comparable or less than that of an obstacle, diffraction happens.

Answer: A.   Both A and R are individually true and R is the correct explanation of A
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