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)

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