- APhoton
- BGraviton
- CProton
- DMeson
Explanation:
Graviton, proton and meson are subatomic particles.
But photon is light energy particle.
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An X-ray machine has an accelerating potential difference of 25,000 volts. By calculation the shortest wavelength will be obtained as (h = 6.63
; e =
coulomb)
|
(a) 0.25 Å |
(b) 0.50 Å |
(c) 1.00 Å |
(d) 2.50 Å |
A circular coil of mean radius of 7 cm and having 4000 turns is rotated at the rate of 1800 revolutions per minute in the earth's magnetic field (B = 0.5 gauss), the maximum e.m.f. induced in coil will be
|
(a) 1.158 V |
(b) 0.58 V |
(c) 0.29 V |
(d) 5.8 V |
Two charged spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant 2, then what is the force (if all conditions are same)
|
(a) |
(b) F |
(c) 2F |
(d) 4F |
When the wave of hydrogen atom comes from infinity into the first orbit then the value of wave number is
|
(a) 109700 cm–1 |
(b) 1097cm–1 |
(c) 109 cm–1 |
(d) None of these |
Atomic weight of boron is 10.81 and it has two isotopes
and
. Then ratio of
in nature would be
|
(a) 19 : 81 |
(b) 10 : 11 |
(c) 15 : 16 |
(d) 81 : 19 |
Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is
|
(a) 5 : 2 |
(b) 7 : 3 |
(c) 49 : 9 |
(d) 9 : 49 |
+ 2C and +6C two charges are repelling each other with a force of 12N. If each charge is given -2C of charge, then the value of the force will be
|
(a) 4N (Attractive) |
(b) 4N (Repulsive) |
(c) 8N (Repulsive) |
(d) Zero |
The mass number of a nucleus is equal to the number of
|
(a) Electrons it contains |
(b) Protons it contains |
|
(c) Neutrons it contains |
(d) Nucleons it contains |
The forbidden energy band gap in conductors, semiconductors and insulators are and
respectively. The relation among them is
|
(a) |
(b) |
|
(c) |
(d) |