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Question:

If we denote microwaves, X rays, infrared, gamma rays, ultra-violet, radio waves and visible parts of the electromagnetic spectrum by M, X, I, G, U, R and V, the following is the arrangement in ascending order of wavelength:

I, M, R, U, V, X and G

R, M, I, V, U, X and G

G, X, U, V, I, M and R

M, R, V, X, U, G and I

Solution:

Answer is C. From the electromagnetic spectrum, we know the ascending order of wavelength is G < X < U < V < I < M < R