Modern Physics Ques 284
- ${ }^{22} Ne$ nucleus, after absorbing energy, decays into two $\alpha$-particles and an unknown nucleus. The unknown nucleus is
$(1999,2 M)$
(a) nitrogen
(b) carbon
(c) boron
(d) oxygen
Show Answer
Answer:
Correct Answer: 284.(b)
Solution:
Formula:
- Atomic number of neon is $10$ .
By the emission of two $\alpha$-particles, atomic number will be reduced by $4$ . Therefore, atomic number of the unknown element will be $Z=10-4=6$
Similarly, mass number of the unknown element will be
$ A=22-2 \times 4=14 $
Unknown nucleus is carbon ( $A=14, Z=6$ ).
BETA
