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1.
If the electron is a hydrogen atom jumps from an orbit with level 
to an orbit with level 
the emitted radiation has a wavelength given by
to an orbit with level the emitted radiation has a wavelength given by
2.
In a hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 
m. Its time period is 
.The current associated with the electron motion is (charge of electron is 
)
m. Its time period is .The current associated with the electron motion is (charge of electron is )
3.
Let the potential energy of hydrogen atom in the ground state be regarded as zero. Then its potential energy in the first excited state will be
4.
If the shortest wavelength in the Lyman series is 911.6 
the longest wavelength in the same series will be
the longest wavelength in the same series will be
5.
According to Bohr's atomic model, the relation between principal quantum number(
) and radius of orbit(
) is
) and radius of orbit() is
6.
The atomic number and the mass number of an atom remains unchanged when it emits
7.
The Rydberg constant 
for hydrogen is
for hydrogen is
8.
For light of wavelength 5000 
photon energy is nearly 2.5 eV. For 
-rays of wavelength 1
, the photon energy will be close to
photon energy is nearly 2.5 eV. For -rays of wavelength 1, the photon energy will be close to
9.
Which of the following transition in Balmer series for hydrogen will have longest wavelength?
10.
Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are exicted by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by hydrogen atom according to Bohr's theory will be