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प्रश्न
Define.
Nuclear fission
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उत्तर
In nuclear fission, the atom of a heavy element is bombarded by a neutron to form an unstable isotope which further splits into two or more smaller nuclei releasing extra neutrons and large amount of energy and heat.
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संबंधित प्रश्न
Compare and contrast bio-mass and hydro electricity as sources of energy.
Which of the following is not a fossil fuel?
(a) coal
(b) petroleum gas
(c) biogas
(d) natural gas
The calorific values of five fuels A, B, C, D and E are given below:
| A | 48KJ/g |
| B | 17KJ/g |
| C | 150KJ/g |
| D | 50KJ/g |
| E | 30KJ/g |
Of what material are the control rods of a nuclear reactor made?
Fill in the following blank with suitable word:
In a nuclear power station, nuclear fission takes place in the .............
If 25 atomic mass units (u) of a radioactive material are destroyed in a nuclear reaction, how much energy is released in MeV?
How much is this energy in MeV? (Speed of light = 3 × 108 m/s)
The energy produced by converting 1 gram mass of a nuclear fuel into energy completely is:
(a) 9 × 1016 J
(b) 9 × 1014 J
(c) 9 × 1015 J
(d) 9 × 1013 J
The disposal of waves produced in a nuclear power plant poses a big problem because it is:
(a) too heavy
(b) highly inflammable
(c) extremely foul smelling
(d) highly radioactive
A nuclear reaction is represented by the equation:
`""_1^2H+_1^2H->_2^3He+xc+E`
State two conditions under which such a reaction takes place.
In what way are these numbers related to the isotopes of an element?
The element `""_11^24 "Na"` changes to magnesium by the emission of a beta particle. Write down the symbolic equation for the beta emission.
State, giving reason, whether the following nuclear decay are allowed or not?
\[\ce{_Z^AX ->_Z^{A-1}Y + _-1^0e}\]
What changes will take place in the mass number and atomic number of the nucleus Y if it emits gamma radiations?
The nucleus B emit a β-particle and is transformed into nucleus C. What is the composition of C?
Explain briefly what changes take place within the nuclei when beta particles are emitted by a radioactive substance.
What are beta rays and gamma rays?
A certain nucleus X has a mass number 15 and atomic number 7. Find the number of neutrons. The nucleus X losses one proton and Express the change and write the symbol of the new nucleus.
When a neutron is bombarded on an atom of uranium, ____________ neutrons generated in this process.
Thermal power generation : Air pollution : : Nuclear power generation : _____________
