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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