The wavefront of a wave has direction with wave motion
parallel
perpendicular
opposite
at an angle of θ
A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is
1.2 cm
1.2 mm
2.4 cm
2.4 mm
The specific rotation of a sugar solution is 0.5 deg m2/kg. 200 kg-m-3 of impure sugar solution is- taken in a sample polarimeter tube of length 20 cm and optical rotation is found to be 19°. The percentage of purity of sugar is
20%
80%
95%
89%
In Young's double-slit experiment with sodium vapor lamp of wavelength 589 nm and the slits 0.589 min apart, the half angular width of the central maximum is
sin-1(0.01)
sin-1(0.0001)
sin-1(0.001)
sin-1(0.1)
When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is
√2 x 108 ms-1
√3 x 108 ms-1
2 x 108 ms-1
3 x 108 ms-1
The intensity of sound gets reduced by 10% on passing through a slab. The reduction in intensity on passing through two consecutive slabs would be
20 %
19 %
5 %
50 %
Four independent waves are expressed as
(i) and (iii)
(i) and (iv)
(ii) and (iv)
not possible at all
Two coherent monochromatic light beams of intensities I and 4 I superimpose. The maximum and minimum possible intensities in the resulting beam are respectively
5I and I
5I and 3I
3I and I
9I and I
Ordinary light incident on a glass slab at the polarising angle suffers a deviation of 22°. The value of the angle of refraction in glass in this case is
56°
68°
34°
22°
Which one of the following does not support the wave nature of light?
Photoelectric effect
Interference
Polarization
Diffraction
A.
Photoelectric effect
Characteristics of photoelectric effect cannot be explained on the basis of the wave theory of light, while interference, polarization and diffraction can be explained on the basis of the wave theory of light. The photoelectric effect shows the particle nature of light according to which light travels in the form of bundles of packets of energy called photons.