Explanation:
When ordinary (unpolarised) light is reflected from a surface, it gets partial polarisation, it means some of the electric vectors in some planes are cut-off. When this partially polarized light is incident on polarized glasses, glass acts as an analyser and therefore block out some reflected light.
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Two electric bulbs (60W and 100W respectively) are connected in series. The current passing through them is
|
(a) More in 100W bulb |
(b) More in 60W bulb |
(c) Same in both |
(d) None of these |
The de-Broglie wavelength of an electron having 80eV of energy is nearly (1eV = 1.6 × 10–19 J, Mass of electron = 9 × 10–31kg Plank’s constant = 6.6 × 10–34 J-sec)
|
(a) 140 Å |
(b) 0.14 Å |
(c) 14 Å |
(d) 1.4 Å |
The a-particle is the nucleus of an atom of
|
(a) Neon |
(b) Hydrogen |
(c) Helium |
(d) Deuterium |
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using
|
(a) Plane mirror |
(b) Convex mirror |
(c) Concave mirror |
(d) None of these |
Fraunhofer lines are obtained in
|
(a) Solar spectrum |
(b) The spectrum obtained from neon lamp |
|
(c) Spectrum from a discharge tube |
(d) None of the above |
Two identical induction coils each of inductance L joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other, what is the net inductance
|
(a) L2 |
(b) 2L |
(c) L/2 |
(d) Zero |