Multiple choice

A student of class 10 of ICSE board gives the clues in the form of reasons for the emission of beta particle to one of his classmates who recently studied the chapter of modern physics. Which of the following clues should he choose to reach the correct reason for this?

  1. An electron of outer orbit comes out of an atom after being excited.

  2. A proton disintegrates into neutron and electron, and this electron comes out of an atom.

  3. A neutron disintegrates into proton and electron, and this electron comes out of an atom.

  4. An electron of inner orbit falls into the nucleus, and finally comes out of an atom.

  5. A neutron strikes the electron of inner orbit and expels it out as a beta particle.
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C Correct answer
Explanation

An atom in which the ratio of neutrons to the protons exceeds unity is unstable. A neutron disintegrates into proton and electron, and this electron comes out of an atom.

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