- AInner orbits of atoms
- BFree electrons existing in nuclei
- CDecay of a neutron in a nucleus
- DPhoton escaping from the nucleus
Explanation:
The electron emitted in beta radiation may originates from neutron and it increases the atomic number 1.
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A ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is refracted in the medium at an angle β. The angle of deviation of the emergent ray from the direction of the incident ray
|
(a) (α - β) |
(b) 2(α- β) |
(c) (α – β)/2 |
(d) (β - α) |
The tail of the comet is due to
|
(a) Vaporisation of water on the comet |
|
(b) Sublimation of vapour in the comet |
|
(c) Cooling of water in the comet |
|
(d) Vaporisation of heat in the comet |
Which of the following is true for number of spectral lines in going form Layman series to Pfund series
|
(a) Increases |
(b) Decreases |
|
(c) Unchanged |
(d) May decreases or increases |
In hydrogen atom, an electron is revolving in the orbit of radius 0.53
with 6.6
rotations/second. Magnetic field produced at the centre of the orbit is
|
(a) 0.125 |
(b) 1.25 |
(c) 12.5 |
(d) 125 |
A prism (μ = 1.5) has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36’ = 0.75)
|
(a) 18° 36’ |
(b) 20° 30’ |
(c) 18° |
(d) 22°1’ |

The particles which can be added to the nucleus of an atom without changing its chemical properties are called
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) None of the above |
The potential difference between point A & B is
|
(a) |
(b) |
(c) |
(d) 0 |