Arrange the following in the ascending order of wavelength (\lambda) : (A) Microwaves (\lambda_1) (B) Ultraviolet rays (\lambda_2) (C) Infrared rays (\lambda_3) (D) X-rays (\lambda_4) Choose the most appropriate answer from the options given below :

\lambda_4\lt \lambda_2\lt \lambda_3\lt \lambda_1

\lambda_4\lt \lambda_3\lt \lambda_2\lt \lambda_1

\lambda_3\lt \lambda_4\lt \lambda_2\lt \lambda_1

\lambda_4\lt \lambda_3\lt \lambda_1\lt \lambda_2

Electromagnetic Waves PYQ — JEE Main 2025 · 24 Jan · Shift 2 · Q64 with Solution

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Correct answer: B

Recall the electromagnetic spectrum order by wavelength
In increasing order of wavelength: $\text{X-rays} < \text{Ultraviolet} < \text{Visible} < \text{Infrared} < \text{Microwaves}$
Match with the given symbols
- Microwaves $\to \lambda_1$
- Ultraviolet rays $\to \lambda_2$
- Infrared rays $\to \lambda_3$
- X-rays $\to \lambda_4$
Arrange in ascending order of wavelength Therefore, $\lambda_4 < \lambda_2 < \lambda_3 < \lambda_1$
Check options
- A: $\lambda_4<\lambda_3<\lambda_2<\lambda_1$ ❌
- B: $\lambda_4<\lambda_2<\lambda_3<\lambda_1$ ✅
- C: $\lambda_3<\lambda_4<\lambda_2<\lambda_1$ ❌
- D: $\lambda_4<\lambda_3<\lambda_1<\lambda_2$ ❌

Hence, the correct option is B.