Question
Which rays are not the portion of electromagnetic spectrum
|
(a) X-rays |
(b) Microwaves |
(c) a-rays |
(d) Radio waves |
✓
Answer
(c) a-rays
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The shape of wave front at a very large distance from source is ______.
A spherical drop of capacitance 1 mF is broken into eight drops of equal radius. Then, the capacitance of each small drop is ......
|
(a) |
(b) 8μF |
(c) |
(d) |
Diamagnetic substances are
|
(a) Feebly attracted by magnets |
(b) Strongly attracted by magnets |
|
(c) Feebly repelled by magnets |
(d) Strongly repelled by magnets |
When the electron in the hydrogen atom jumps from 2nd orbit to 1st orbit, the wavelength of radiation emitted is 𝜆. When the electrons jump from 3rd orbit to 1st orbit, the wavelength of emitted radiation would be
|
(a) |
(b) |
(c) |
(d) |
The energy band gap (distance between the conduction band and valence band) in conductor is.
What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jump from fourth orbit to second orbit and from third orbit to second orbit
| (a) 27 : 25 | (b) 20 : 27 |
(c) 20 : 25 |
(d) 25 : 27 |
If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then
|
(a) Stopping potential will decrease |
|
(b) Stopping potential will increase |
|
(c) Kinetic energy of emitted electrons will decrease |
|
(d) The value of work function will decrease |
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
|
(a) 9 : 4 |
(b) 4 : 3 |
(c) 3 : 8 |
(d) 3 : 2 |
The equivalent path of an optical path of length 't' in glass slab of refractive index n in vacuum is :
X – rays and γ - rays of the same energies may be distinguished by
|
(a) Their velocity |
(b) Their ionising power |
|
(c) Their intensity |
(d) Method of production |