We can hear sound of a person around the corner but cannot see because of ……………

1 )   We can hear sound of a person around the corner but cannot see because of  …………….

A ) Polarization ,                                        b ) Diffraction ,

C ) Both ,                                                    c ) None ,

Correct Answer : -  b )  Diffraction  ,

Because the sound waves have much greater wavelengths as compare to light waves . Sound waves also undergoes bending , diffraction , moving , spreading , etc . So that  the diffraction of the sound waves around the corner is noticeable and we can easily hear the sound around the corners rather we can't see a person around the corners. But sound waves  does not undergoes polarization . Polarization is a property that applies to transverse waves which specifies the geometrical orientation of oscillations . Light waves undergoes the polarization . In the transverse waves , the direction of oscillation and the direction of motion of the waves are perpendicular to each other .

2 )  Huygens wave theory of light cannot explain …….............…………..

A ) Polarization ,                                        B ) Diffraction ,

C)  Photoelectric effect ,                                       D )  None of these ,

Correct answer : -       A )   Photoelectric effect ,

Huygen wave theory of  light explains diffraction , polarization  and also interference but cannot explains the photoelectric effect of light , because  of particle’s  nature of the light .

3 )   Child paradox is a consequences of  ............................ ,

A ) Time dilation ,                                      B ) Mass dilation ,

C ) Length contraction ,                    D ) None of these ,

Correct Answer : -  A ) Time dilation ,

4 )   The blue color of sky is seems to be blue because of  …………….. ,

A ) Scattering ,                                  B ) Diffraction ,

C ) Both of these ,                                       D ) None of these ,

Correct Answer : -  A ) Scattering ,

Because such type of scattering refers to the scattering of electromagnetic radiation of smaller wavelength .And blue light is scattered in all directions by the very small ( tiny ) particles of air in atmosphere . Due to small wavelength blue light scatters more than other colors e.g. red etc .

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