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प्रश्न
Why are control rods used in nuclear reactors?
उत्तर
In the nuclear reactor, nuclear fission of nuclei to atoms like uranium or plutonium occurs. Control rods are used to speed up or slow down the chain reaction.
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संबंधित प्रश्न
What is a fuel? Give five examples of fuels.
Of what material are the control rods of a nuclear reactor made?
What is nuclear fusion? Explain with an example. Write the equation of the reaction involved.
Why are very high temperatures required for fusion to occur?
Write Einstein's mass-energy equation. Give the meaning of each symbol which occurs in it.
Calculate the energy released in joules when 5 g of a material is completely converted into energy doing a nuclear reaction.
The control rods used in the reactor of a nuclear power plant are made of:
(a) steel
(b) graphite
(c) uranium
(d) boron
One type of energy which has not been controlled so far is:
(a) ocean thermal energy
(b) nuclear fusion energy
(c) geothermal energy
(d) nuclear fission energy
The heat energy released during nuclear fission and fusion is due to the:
(a) conversion of stored chemicals into energy
(b) conversion of momentum into energy
(c) conversion of mass into energy
(d) conversion of magnetism into energy
A nuclear reaction is represented by the following equation:
`""_92^235U+_0^1n-> _56^139Ba+_36^94Kr+xc+E`
Name the process represented by this equation and describe what takes place
The mass numbers of four elements A, B, C and D are 2, 20, 135 and 235, respectively. Which one of them will be most suitable to make:
a hydrogen bomb?
Complete the following nuclear change:
\[\ce{_92P^238->[-α] ...P1 ... ->[-β]...P2 ... ->[-β] ... P3 ...}\]
A nucleus `"_11Na^24` emits a beta particle to change into Magnesium (Mg).
(i) Write the symbolic equation for the process.
(ii) What are numbers 24 and 11 called?
(iii) What is the general name `"_12^24Mg` with respect to `"_11^24Na`?
What changes occur in the nucleus of a radioactive element when it emits an alpha particle? Show by an example?
State three properties of α-rays.
State charge and mass of α-particle.
State the energy conversion taking place in a solar cell.
What is nuclear waste? What are hazard of nuclear waste to living beings? How is nuclear waste disposed off?
What is stellar energy?
Express 1 a.m.u. in MeV.
