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1.
A nucleus of mass 214 amu in free state decays to emit an 
-particle. Kinetic energy of the -particle emitted is 
. The recoil energy (in 
) of the daughter nucleus is
-particle. Kinetic energy of the -particle emitted is . The recoil energy (in ) of the daughter nucleus is
2.
It is easier to ionize hydrogen as compared to deuterium, because
3.
The nucleus 
absorbs an energetic neutron and emits a beta particle 
. The resulting nucleus is
absorbs an energetic neutron and emits a beta particle . The resulting nucleus is
4.
Energy of an electron in 
orbit of hydrogen atom is 
orbit of hydrogen atom is
5.
In a radioactive decay. The half-life of radioactive substance is T1/2 = 69.3s. The decay constant is
6.
Three fourth of the active decays in a radioactive sample in 
. The half life of the sample is
. The half life of the sample is
7.
Energy levels A, B, C of a certain atom corresponding to increasing values of energy, 
If 
are the wavelength of radiations corresponding to the transitions 
to 
to 
and to respectively, which of the following statements is correct
If are the wavelength of radiations corresponding to the transitions to to and to respectively, which of the following statements is correct
8.
Half-life of radio-active substance is 140 days. Initially, is 16 g. Calculate the time for this substance when it reduces to 1 g
9.
An electron with kinetic energy 
is incident on a 
-atom in its ground state. The collision
is incident on a -atom in its ground state. The collision
10.
If scattering particles are 56 for 
angle, then at an angle 
it will be
angle, then at an angle it will be