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1.
X-rays are
2.
Work function of lithium and copper are respectively 
and 
Which one of the metal will be useful for the photoelectric cell working with visible light 
-
and Which one of the metal will be useful for the photoelectric cell working with visible light -
3.
In Davisson - Germer experiment maximum intensity is observed at
4.
The correctness of velocity of an electron moving with velocity 
is 0.005%. The accuracy with which its position can be measured will be
is 0.005%. The accuracy with which its position can be measured will be
5.
Kinetic energy of emitted cathode rays is dependent on
6.
When cathode-rays strike a metal target of high melting point with a very high velocity, then which of the following are produced
7.
Light of wavelength 4000 
is incident on a metal plate whose work function is 2 eV. The maximum KE of the emitted photoelectron would be
is incident on a metal plate whose work function is 2 eV. The maximum KE of the emitted photoelectron would be
8.
In an 
-rays tube, the intensity of the emitted -rays beam is increased by
-rays tube, the intensity of the emitted -rays beam is increased by
9.
The ratio transmitter operates on a wavelength of 1500 m at a power of 400 kW. The energy of radio photon (in joule) is
10.
For an electron in the second orbit of Bohr's hydrogen atom, the moment of linear momentum is