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The frequencies of X-rays, γ-rays and ultraviolet rays are respectively p, q and r. Then

Asked in GUJCET 2015 · Order of the bands

Answer: (2) p < q, q > r

Step-by-step solution

Idea: frequency rises as one goes up the spectrum: radio, microwave, infrared, visible, ultraviolet, X-rays, gamma rays.

So of these three, ultraviolet has the lowest frequency and gamma rays the highest, with X-rays in between: u_γ > u_X > u_UV.

Writing p for X-rays, q for gamma rays and r for ultraviolet, this reads q > p > r.

Splitting that into the two comparisons asked for: p < q and q > r.

Why the other options are wrong

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