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Which of the following is the radio isotope in pair? A1939A219239K,A1940A219240K Give reason for your answer. - Physics

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Question

Which of the following is the radio isotope in pair?

\[\ce {^39_19 K , ^40_19 K}\]

Give reason for your answer.

Give Reasons
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Solution

\[\ce {^40_19 K}\]

The reason is that the number of neutrons exceeds the number of  protons.

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Chapter 12: Radioactivity - EXERCISE - 12(A) [Page 300]

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Selina Physics [English] Class 10 ICSE
Chapter 12 Radioactivity
EXERCISE - 12(A) | Q 43. (c) | Page 300
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