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1.
During the 
2.
Which of the following particles are constituents of the nucleus
3.
A radioactive nucleus can decay simultaneously by two different processes which have decay constant 
.The effective decay constant of the nuclide is 
where
.The effective decay constant of the nuclide is where
4.
The element used for radioactive carbon dating for more than 56000 yr is
5.
The half-life of 
is 5 days. What time is taken by 
part of the sample to decay
is 5 days. What time is taken by part of the sample to decay
6.
In hydrogen atom, the electron is moving round the nucleus with velocity 
in an orbit of radius 
. The acceleration of the electron is
in an orbit of radius . The acceleration of the electron is
7.
The ratio of the wavelengths for 
transition on 
and 
is
transition on and is
8.
Which is the correct expression for half-life
9.
The radius of a nucleus with atomic mass number 7 is 2fermi. Find the radius of nucleus with atomic number 189.
10.
A diatomic molecule is made of two masses 
and 
which are separated by a distance 
. If we calculate its rotational energy by applying Bohr's rule of angular momentum quantization, its energy will be given by (
is an integer)
and which are separated by a distance . If we calculate its rotational energy by applying Bohr's rule of angular momentum quantization, its energy will be given by ( is an integer)