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The binding energy of deuteron 
is 1.112 MeV per nucleon and an α - particle 
has a binding energy of 7.047 MeV per nucleon. Then in the fusion reaction 
the energy Q released is
|
(a) 1 MeV |
(b) 11.9 MeV |
(c) 23.8 MeV |
(d) 931 MeV |
Gases begin to conduct electricity at low pressure because
|
(a) At low pressure, gases turn to plasma |
|
(b) Colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionisation of atoms |
|
(c) Atoms break up into electrons and protons |
|
(d) The electrons in atoms can move freely at low pressure |
The wavelength of 
X-rays produced by an X-ray tube is 0.76 Å. The atomic number of the anode material of the tube is
| (a) 20 | (b) 60 | (c) 40 | (d) 80 |
According to Bohr's theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be
|
(a) 2πh |
(b) πh |
(c) |
(d) |
The half life of 
is 8 days. Given a sample of at time t = 0, we can assert that
|
(a) No nucleus will decay before t = 4 days |
|
(b) No nucleus will decay before t = 8 days |
|
(c) All nuclei will decay before t = 16 days |
|
(d) A given nucleus may decay at any time after t = 0 |
The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium
| (a) Can easily be broken up | (b) Is very stable |
| (c) Can be used as fissionable material | (d) Is radioactive |
