First slide

Radio activity

Question

A nucleus decays by $β^{+}$ emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively,
the corresponding numbers for the daughter nucleus are respectively.

Moderate

A

Z - 1 and A - 1
B

Z + 1 and A
C

Z - 1 and A
D

Z + 1 and A - 1

Solution

After $β^{+} ({}_{+ 1}e^{0})$ emission atomic number decreases by one and mass number remain unchanged. $γ$ -emission, there will be no change on mass number and atomic number.

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