Question:
Choose the correct option relating wavelengths of different parts of electromagnetic wave spectrum :
Choose the correct option relating wavelengths of different parts of electromagnetic wave spectrum :
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Wavelength order from longest to shortest: radio, microwave, infrared, visible, ultraviolet, X-rays, gamma rays.
Updated On: Nov 5, 2026
- \(\lambda_{\text{radio waves}} \gt \lambda_{\text{micro waves}} \gt \lambda_{\text{visible}} \gt \lambda_{x\text{-rays}}\)
- \(\lambda_{\text{visible}} \gt \lambda_{x\text{-rays}} \gt \lambda_{\text{radio waves}} \gt \lambda_{\text{micro waves}}\)
- \(\lambda_{x\text{-rays}} \lt \lambda_{\text{micro waves}} \lt \lambda_{\text{radio waves}} \lt \lambda_{\text{visible}}\)
- \(\lambda_{\text{visible}} \lt \lambda_{\text{micro waves}} \lt \lambda_{\text{radio waves}} \lt \lambda_{x\text{-rays}}\)
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The Correct Option is A
Solution and Explanation
The electromagnetic spectrum in decreasing wavelength: radio waves (\(\gtrsim 0.1\ \mathrm{m}\)) \(\gt\) microwaves (about 1 mm to 30 cm) \(\gt\) infrared \(\gt\) visible (about 400 to 700 nm) \(\gt\) ultraviolet \(\gt\) X-rays (about 0.01 to 10 nm) \(\gt\) gamma rays.
So \(\lambda_{radio} \gt \lambda_{micro} \gt \lambda_{visible} \gt \lambda_{x\text{-ray}}\), which is option 1. Options 2 and 3 place visible light above radio waves or microwaves, and option 4 puts X-rays at the longest wavelength, all wrong.
Answer: (1) \(\lambda_{\text{radio waves}} \gt \lambda_{\text{micro waves}} \gt \lambda_{\text{visible}} \gt \lambda_{x\text{-rays}}\)
So \(\lambda_{radio} \gt \lambda_{micro} \gt \lambda_{visible} \gt \lambda_{x\text{-ray}}\), which is option 1. Options 2 and 3 place visible light above radio waves or microwaves, and option 4 puts X-rays at the longest wavelength, all wrong.
Answer: (1) \(\lambda_{\text{radio waves}} \gt \lambda_{\text{micro waves}} \gt \lambda_{\text{visible}} \gt \lambda_{x\text{-rays}}\)
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