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1.
The Kinetic energy of the electron in an orbit of radius 
in hydrogen atom is (
electronic charge)
in hydrogen atom is (electronic charge)
2.
Imagine an atom made up of proton and a hypothetical particle of double the mass of electron, but having the same charge as that of electron. Apply the Bohr atom model and consider all possible transitions of this hypothetical particle to the first excited level. The longest wavelength photon that will be emitted has wavelength 
(given in terms of Rydberg constant 
for hydrogen atom) equal to
(given in terms of Rydberg constant for hydrogen atom) equal to
3.
If 
and 
are the potential energy and kinetic energy of the electron in stationary orbit in the hydrogen atom, the value of 
is
and are the potential energy and kinetic energy of the electron in stationary orbit in the hydrogen atom, the value of is
4.
Let the PE of hydrogen atom in the ground state be zero. Then its total energy in the first excited state will be
5.
An alpha nucleus of energy 
bombards a heavy nuclear target of charge 
. Then the distance of closest approach for the alpha nucleus will be proportional to
bombards a heavy nuclear target of charge . Then the distance of closest approach for the alpha nucleus will be proportional to
6.
A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 
. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15n . What will be observed by the detector?
. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15n . What will be observed by the detector?
7.
Which state of triply ionised beryllium (
) has the same orbital radius as that of ground state of hydrogen?
) has the same orbital radius as that of ground state of hydrogen?
8.
The energy of an electron in 
th orbit of the hydrogen atom is given by 
The energy required to raise an electron from the first orbit to the second orbit will be
th orbit of the hydrogen atom is given by The energy required to raise an electron from the first orbit to the second orbit will be
9.
When a hydrogen atom is bombared, the atom is excited to then 
state. The energy released, when the atom goes from state to the ground state is
state. The energy released, when the atom goes from state to the ground state is
10.
Energy 
of a hydrogen atom with principal quantum number is given by 
= 
.The energy of a photon ejected when the electron jumps from
n =3 state to 
state of hydrogen , is approximately
of a hydrogen atom with principal quantum number is given by = .The energy of a photon ejected when the electron jumps fromn =3 state to state of hydrogen , is approximately