Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is
|
(a) 15 J |
(b) 16 |
(c) 4 |
(d) 4 |
Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is
|
(a) 15 J |
(b) 16 |
(c) 4 |
(d) 4 |
(c) 4
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The velocity of light in a medium is half its velocity in air. If ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is
|
(a) 15o |
(b) 30 o |
(c) 45 o |
(d) 60 o |
For the sustained interference of light, the necessary condition is that the two sources should
|
(a) Have constant phase difference |
(b) Be narrow |
|
(c) Be close to each other |
(d) Of same amplitude |
A particle A has charge +q and a particle B has charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speed
will become
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 1 : 4 |
(d) 4 : 1 |
A 100 ohm galvanometer gives full scale deflection at 10 mA. How much shunt is required to read 100 mA
|
(a) 11.11 ohm |
(b) 9.9 ohm |
(c) 1.1 ohm |
(d) 4.4 ohm |
An electromagnetic wave travels along z-axis. Which of the following pairs of space and time varying fields would generate such a wave
|
(a) |
(b) |
(c) |
(d) |