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1.
The longest 
for the Lyman series is : (Given 
)
for the Lyman series is : (Given )
2.
The angular momentum of electron in 
orbit is given by:
orbit is given by:
3.
According to 
postulates which quantity can take up only discrete values:
postulates which quantity can take up only discrete values:
4.
When the frequency of light incident on a metallic plate is doubled, the 
of the emitted photoelectrons will be:
of the emitted photoelectrons will be:
5.
The mass of one mole of electron is:
6.
The velocities of two particles 
and 
are 0.05 and 0.02
respectively. The mass of is five times the mass of . The ratio of their de-Broglie's wavelength is
and are 0.05 and 0.02 respectively. The mass of is five times the mass of . The ratio of their de-Broglie's wavelength is
7.
Which are in the ascending order of wavelength?
8.
is wrong because it violates
The representation of the ground state electronic configuration of He by box-diagram as
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9.
The electronic configuration of the element which is just above the element with atomic number 43 in the same particle group is:
10.
The order of filling of electrons in the orbital of an atom will be: