The blue colour of the sky is due to___________________?
(A) diffraction
(B) reflection
(C) polarization
(D) scattering
In an interference pattern______________________?
(A) bright fringes are wider than dark fringes
(B) dark fringes are wider than bright fringe
(C) both dark and bright fringes are of equal width
(D) central fringes are brighter than the outer fringes
In Young double slit experiment, if white light is used____________________?
(A) alternate dark and bright fringes will be seen
(B) coloured fringes will be seen
(C) no interference fringes will be seen
(D) impossible to predict
When crest of one wave falls over the trough of the other wave this phenomenon is known as________________?
(A) polarization
(B) constructive interference
(C) destructive interference
(D) diffraction
Which one of the following is nearly monochromatic light ?
(A) light form fluorescent tube
(B) light form neon lamp
(C) light form sodium lamp
(D) light form simple lamp
A point source of light placed in a homogeneous medium gives rise to ___________________?
(A) a cylindrical wave front
(B) an elliptical wave front
(C) a spherical wave front
(D) a plane wave front
Longitudinal waves do not exhibit _____________________?
(A) reflection
(B) refraction
(C) diffraction
(D) polarization
Photoelectric effect was given by ____________________?
(A) Hertz
(B) Fresnel
(C) Einstein
(D) Plank
Which one of the following properties of light does not change with the nature of the medium ?
(A) velocity
(B) wavelength
(C) amplitude
(D) frequency
In double slit experiment we observe _____________________?
(A) interference fringes only
(B) diffraction fringes only
(C) both interference and diffraction fringes
(D) polirized frringes