12th Class Physics MCQS
The typical nuclei are less than:
10-16m
10-14m
10-12m
10-10m
Laser is a device which can produce:
All of the above
Coherant beam of light
Monochromatic beam of light
Intense beam of light
In the Bohr’s model of the hydrogen atom, the lowest orbit corresponds to:
Maximum energy
Minimum energy
Zero energy
Infinite energy
Life time of metastable states is
None of these
10-5 sec or more
10-3 sec or more
10-6 sec or more
In according with Bohr’s theory the K.E of the electron is equal to:
Ze2/2r2
ke2/2r
Ze2/r
Ze2/r2
Electron volt is unit of:
Potential energy
heat energy
Chemical energy
Nuclear energy
The 1st Bohr atom in the hydrogen atom has radius
0.53 x 10-11 m
3.56 x 10-10 m
0.053 x 10-11 m
5.30 x 10-11 m
The temperature of core of nuclear reactor is:
1300°C
1400°C
1100°C
1200°C
Boher proposed his atomic model in:
1911
1910
1913
1912
The X-rays diffraction with crystal was first studied by
Michelson
W.L. Bragg
None of these
W.H Bragg