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Modern Physics — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsModern Physics2 Marks
Question
(a) What are
(i) beta particles, (ii) gamma radiations?
(b) Explain briefly what changes take place within the nuclei, when beta particle is emitted by a radioactive substance.
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Answer

(a) (i) Electrons ejected by the nueleus of a radioactive element are called beta ( B ) partieles.
(ii) The electromagnetic radiations of wavelength less than $10^{-2} A$ ejected by the nucleus of a radioactive element are called gamma radiations.
(b) When a nucleus ejects a beta particle, it decays into the nucleus of another element where mass number remains same, but atomic number increases by 1 amu.

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