- AThe frequency of the emitted photon will double.
- ✓Twice as many photons will be released.
- CFour times more photons will be emitted than before.
- DThere is no effect.
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The equivalent resistance between the points P and Q in the network given here is equal to (given r = )
|
(a) |
(b) 1 W |
(c) |
(d) 2 W |
In P-type semiconductor the majority and minority charge carriers are respectively
|
(a) Protons and electrons |
(b) Electrons and protons |
|
(c) Electrons and holes |
(d) Holes and electrons |
A zone plate of focal length 60 cm, behaves as a convex lens, If wavelength of incident light is 6000, then radius of first half period zone will be
|
(a) 36 |
(b) 6 |
(c) |
(d) 6 |
The relation among u, v and f for a mirror is:
For harder X-rays
| (a) The wavelength is higher | (b) The intensity is higher |
| (c) The frequency is higher | (d) The photon energy is lower |
Plane of eddy currents makes an angle with the plane of magnetic lines of force equal to
|
(a) 40° |
(b) 0° |
(c) 90° |
(d) 180° |