Physics Alternating Current ETEA 2017
PMDC Verified Question 91 of 127

Which of the following arrangements correctly orders the regions of the electromagnetic spectrum in terms of decreasing wavelength (longest to shortest)?
A
Infrared \( > \) Ultraviolet \( > \) Visible \( > \) Microwave \( > \) Radio frequency
B
Radio frequency \( > \) Microwave \( > \) Infrared \( > \) Visible \( > \) Ultraviolet
C
Microwave \( > \) Infrared \( > \) Visible \( > \) Ultraviolet \( > \) Radio frequency
D
Visible \( > \) Infrared \( > \) Ultraviolet \( > \) Microwave \( > \) Radio frequency
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Radio frequency \( > \) Microwave \( > \) Infrared \( > \) Visible \( > \) Ultraviolet
Concept:

This question requires organizing the electromagnetic spectrum by wavelength from longest to shortest.

Solution:

Wavelength (\( \lambda \)) is inversely proportional to frequency. The correct order from longest wavelength (lowest frequency) to shortest wavelength (highest frequency) is:

$$\text{Radio frequency} > \text{Microwave} > \text{Infrared} > \text{Visible Light} > \text{Ultraviolet}$$

Why other options are incorrect:

  • Other options place shorter wavelength bands (like ultraviolet or visible light) before longer wavelength bands (like microwave or infrared), violating the order of decreasing wavelength.

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