Nuclear Physics And Radioactivity Question 273
Question: A radioactive nucleus undergoes a series of decay according to the scheme $ A\xrightarrow{\alpha }A_{1}\xrightarrow{\beta }A_{2}\xrightarrow{\alpha }A_{3}\xrightarrow{\gamma }A_{4} $ If the mass number and atomic number of A are 180 and 72 respectively, then what are these number for A4 [Roorkee 1986; MP PET 2002; KCET 2003; DPMT 2005]
Options:
A) 172 and 69
B) 174 and 70
C) 176 and 69
D) 176 and 70
Show Answer
Answer:
Correct Answer: A
Solution:
$ _{72}A^{180} $
$\xrightarrow{\alpha_{70}} A_1^{176}$
$\xrightarrow{\beta_{71}} A_{2}^{176}$
$\xrightarrow{\alpha_{69}}A_{3}^{172} $
$ \xrightarrow{\gamma_{69}}A_{4}^{172} $
BETA
