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प्रश्न
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
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उत्तर
(i) Alpha particles are heavy in mass and are positively charged so they are deflected less and are deflected towards - charged plate.
(ii) Beta particles are negIigible in mass so they are highly deflected by electric field anc they are negatively charge particle so they are deflected towards positive charged plate.
(iii) Gamm a radiations have no mass and no charge so they are not deflected by electric field.
Source S is placed in thick lead container because it is radioactive substance and radiates. Thick walls of lead absorb a II the radiation except radiation going straight outside towards opened end. Thus, thick walIs help to reduce leakage of radiations outside.
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संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
An element `""_ZS^A` decays to `""_85R^222` after emitting 2 α particles and 1 β particle.
Find the atomic number and atomic mass of the element S.
What is thermionic emission?
What happens to the atomic number of element when (i) An α -particle, (ii) A β -particle 1 and (iii) γ-radiation is emitted?
State three safety precautions that you would take while handling the radioactive substances.
Are all the radiations viz. α, β and γ emitted in a single radioactive decay?
From α, β and γ-rays, name the one which travels with the speed of light?
State three ways of obtaining an electron-beam.
Assertion (A): The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.
Reason (R): Rutherford did α-particles scattering experiment.
