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If microwaves, X-rays, infrared radiation, gamma rays, ultraviolet radiation, radio waves, and visible light in the electromagnetic spectrum are represented by M, X, I, G, U, R, and V respectively, which sequence gives them in increasing order of wavelength?

1. R, M, I, V, U, X and G
2. M, R, V, X, U, G and I
3. G, X, U, V, I, M and R
4. I, M, R, U, V, X and G

Correct answer: G, X, U, V, I, M and R

Solution

In order of increasing wavelength: gamma (G) < X-rays (X) < ultraviolet (U) < visible (V) < infrared (I) < microwave (M) < radio (R), i.e. G, X, U, V, I, M, R.

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