In this question, a statement of assertion 
is followed by a statement of reason 
. Mark the correct choice as:
Assertion: Diffraction is common in sound but not common in light waves.
Reason: Wavelength of light is more than the wavelength of sound.
Text Solution
Verified by ExpertsC
For diffraction of a wave, size of an obstacle or aperture should be comparable to the size of wavelength of the wave. As wavelength of light is of the order of 
and obstacle/aperture of this size are rare, therefore, diffraction is not common in light waves. On the contrary, wavelength of sound is of the order of 1 m and obstacle / aperture of this size are readily available, therefore, diffraction is common in sound.
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