JEE Main 2025 Jan 24 Shift 2, Physics Q2: Electromagnetic Spectrum

JEE Main2025Jan 24, Shift 2Physics

Arrange the following in the ascending order of wavelength $(λ)$ :

(A) Microwaves $(λ_{1})$

(B) Ultraviolet rays $(λ_{2})$

(D) X-rays $(λ_{4})$

Choose the most appropriate answer from the options given below :

Solution

On the electromagnetic spectrum, wavelength increases (and frequency decreases) in the order:

$γ -rays < X -rays < U V < visible < I R < microwaves < radio waves$

Mapping the four given radiations:

X-rays $(λ_{4}) <$ UV $(λ_{2}) <$ Infrared $(λ_{3}) <$ Microwaves $(λ_{1})$

$∴ λ_{4} < λ_{2} < λ_{3} < λ_{1}$

Correct option: (3)

Concept behind this question

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