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1.
A neon sign does not produce
2.
If 
is radius of first Bohr orbit in hydrogen atom, the radius of the third orbit is
is radius of first Bohr orbit in hydrogen atom, the radius of the third orbit is
3.
The product of linear momentum and angular momentum of an electron of the hydrogen atom is proportional to
, where 
is
, where is
4.
In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to
5.
In the spectrum of hydrogen atom, the ratio of the longest wavelength in Lyman series to the longest wavelength in the Balmer series is
6.
Wavelength of first line in Lyman series is 
The wavelength of first line in Balmer series is
The wavelength of first line in Balmer series is
7.
The colour of the second line of Balmer series is
8.
Continuous emission spectrum is produced by
9.
Assuming the mass of earth as 
kg and the average mass of the atoms that makes up earth as 40 u (atomic mass unit), the number of atoms in the earth is approximately
kg and the average mass of the atoms that makes up earth as 40 u (atomic mass unit), the number of atoms in the earth is approximately
10.
The total energy of an electron in the first excited state of hydrogen is about 
Its kinetic energy in this state is
Its kinetic energy in this state is