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 $\gamma rays=5\times {10}^{20}to3\times {10}^{19}Hz$

Frequency range of $X-rays=3\times {10}^{19}to{10}^{16}Hz$

Frequency range of ultraviolet rays $={10}^{16}to8\times {10}^{14}$

So frequency of $\gamma$ rays > frequency of $X-$ rays > frequency of ultraviolet rays

$n_1>n_2>n_3$