A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light:
Explanation:
The intensity o light is first increases then decreases.
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The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr's theory, the energy corresponding to a transition between the 3rd and the 4th orbit is
|
(a) 3.40 eV |
(b) 1.51 eV |
(c) 0.85 eV |
(d) 0.66 eV |
The power of two convex lenses A and B are 8 diopters and 4 diopters respectively. If they are to be used as a simple microscope, the magnification of
|
(a) B will be greater than A |
(b) A will be greater than B |
|
(c) The information is incomplete |
(d) None of the above |
A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an upright image of the object coincident with it
| (a) 12 cm | (b) 30 cm |
(c) 50 cm |
(d) 60 cm |
The velocity of light emitted by a source S observed by an observer O, who is at rest with respect to S is c. If the observer moves towards S with velocity v, the velocity of light as observed will be
|
(a) c + v |
(b) c - v |
(c) c |
(d) |
For a thermocouple the neutral temperature is 270℃ when its cold junction is at 20℃. What will be the neutral temperature and the temperature of inversion when the temperature of cold junction is increased to 40 ℃
|
(a) 290℃, 580℃ |
(b) 270℃, 580℃ |
(c) 270℃, 500 ℃ |
(d) 290 ℃, 540 ℃ |
A nucleus of an element 
emits an a-particle first, a b-particle next and then a gamma photon. The final nucleus formed has an atomic number
|
(a) 200 |
(b) 199 |
(c) 83 |
(d) 198 |
