Decrease in atomic number is observed during:

α

-emission

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β

-emission

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Positron emission

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K

-capture

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Solution

The correct options are
A $α$ -emission
C $K$ -capture
D Positron emission
Nucleides that affect atom number are $α -$ particle, $β^{\pm} -$ particle and K-capture electrons.
Only $α, β^{+}$ and $K - e^{-}$ capture cause decrease in atomic number.

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Q. Decrease in atomic number is observed during :
A)

α

-emission
B)

β

-emission
C) positron emission
D) electron capture

Q. An emission of

α

-particle decreases the atomic number of parent element by :

The mean lives of a radioactive substance are 1620 and 405 years for $α$ -emission and $β$ -emission respectively. Find out the time during which three fourth of a sample will decay if it is decaying both by $α$ -emission and $β$ -emission simultaneously.