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1.
In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy 
and the radius 
of the first orbit will be (
is the Bohr radius)
and the radius of the first orbit will be ( is the Bohr radius)
2.
From a newly formed radioactive substance (Half life 
), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is
), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is
3.
A nucleus 
emits one 
and one 
-particle. The resulting nucleus is
emits one and one -particle. The resulting nucleus is
4.
In the reaction 
if the binding energies of 
and 
are respectively 
and 
(in 
), then the energy (in ) released in this reaction is
if the binding energies of and are respectively and (in ), then the energy (in ) released in this reaction is
5.
According to classical theory, the circular path of an electron in Rutherford atom is
6.
A radioactive substance contains 10000 nuclei and its half-life period is 20 days. The number of nuclei present at the end of 10 days is
7.
Two energy levels of an electron in an atom are separated by 
. The frequency of radiation emitted when the electrons goes from higher to the lower level is
. The frequency of radiation emitted when the electrons goes from higher to the lower level is
8.
The energy of the highest energy photon of Balmer series of hydrogen spectrum is close to
9.
A hydrogen atom emits a photon corresponding to an electron transition from 
to 
. The recoil speed of hydrogen atom is almost (mass of proton 
)
to . The recoil speed of hydrogen atom is almost (mass of proton )
10.
Nuclear forces are