In Young's double slit experiment how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ = 2000
and d = 7000
|
(a) 12 |
(b) 7 |
(c) 18 |
(d) 4 |
(b) 7
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Equal potentials are applied on an iron and copper wire of same length. In order to have the same current flow in the two wires, the ratio r (iron)/r (copper) of their radii must be (Given that specific resistance of iron = 
ohm–m and specific resistance of copper = 1.7 
ohm-m)
|
(a) About 1.2 |
(b) About 2.4 |
(c) About 3.6 |
(d) About 4.8 |
In Fresnel’s biprism (μ = 1.5) experiment the distance between source and biprism is 0.3 m and that between biprism and screen is 0.7m and angle of prism is 1°. The fringe width with light of wavelength 6000 Å will be
|
(a) 3 cm |
(b) 0.011 cm |
(c) 2 cm |
(d) 4 cm |
Television signals on earth cannot be received at distances greater than 100 km from the transmission station. The reason behind this is that
|
(a) The receiver antenna is unable to detect the signal at a distance greater than 100 km |
|
(b) The TV programme consists of both audio and video signals |
|
(c) The TV signals are less powerful than radio signals |
|
(d) The surface of earth is curved like a sphere |