- AInfrared waves
- BGamma rays
- CMicrowaves
- DRadio waves
Explanation:
Gamma rays have a maximum frequency.
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Hydrogen atom emits blue light when it changes from n = 4 energy level to the n = 2 level. Which colour of light would the atom emit when it changes from the n = 5 level to the n = 2 level
|
(a) Red |
(b) Yellow |
(c) Green |
(d) Violet |
The half life period of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years is
|
(a) |
(b) |
(c) |
(d) |
The valence of the impurity atom that is to be added to germanium crystal so as to make it a N-type semiconductor, is
|
(a) 6 |
(b) 5 |
(c) 4 |
(d) 3 |
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 |