Question

Number of neutrons in $C^{12}$ and $C^{14} \, are$

• A. 8 and 6
• B. 6 and 8
• C. 6 and 6
• D. 8 and 8

Answer 1

Answer: (A)

8 and 6

Answer 2

As, $4 \times 10^{3}=10^{20} \times h f$
$\Rightarrow f=\frac{4 \times 10^{3}}{10^{20} \times 6.023 \times 10^{-34}}$
$=6.64 \times 10^{16} Hz$
The obtained frequency lies in the band of $X$-rays.