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Arrange the following in the ascending order of wavelength (λ) : (A) Microwaves (λ1) (B) Ultraviolet rays (λ2) (C) Infrared rays (λ3) (D) X-rays (λ4) Choose the most appropriate answer from the options given below :-

1. λ4 < λ3 < λ2 < λ1
2. λ3 < λ4 < λ2 < λ1
3. λ4 < λ2 < λ3 < λ1
4. λ4 < λ3 < λ1 < λ2

Correct answer: λ3 < λ4 < λ2 < λ1

Solution

The correct order of wavelengths from shortest to longest is X-rays (λ4), followed by Ultraviolet rays (λ2), then Infrared rays (λ3), and finally Microwaves (λ1). This arrangement reflects the electromagnetic spectrum where X-rays have the shortest wavelengths and microwaves have the longest.

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