Question

In electromagnetic spectrum, the frequencies of $\gamma$-rays, $X$-rays and ultraviolet rays are denoted by $n_1,n_2$ and $n_3$ respectively then

• A. $n_1>n_2>n_3$
• B. $n_1<n_2<n_3$
• C. $n_1>n_2<n_3$
• D. $n_1<n_2>n_3$

Answer 1

The correct option is A $n_1>n_2>n_3$

Frequency range of ultraviolet $\simeq {10}^{16}-8\times {10}^{14}\left(n_3\right)$
Frequency range of X-rays $\simeq 3\times {10}^{19}-{10}^{16}\left(n_2\right)$
Frequency range of $\gamma$-rays $\simeq 5\times {10}^{20}-3\times {10}^{19}\left(n_1\right)\therefore n_1>n_2>n_3$