Question:easy

Arrange the following electromagnetic waves in the ascending order of their energies.
A. X-rays
B. UV-rays
C. Infrared rays
D. Microwaves
Choose the correct answer from the options given below:

Show Hint

Energy rises with frequency. Microwaves have the lowest frequency of the four.
Updated On: Oct 1, 2026
  • A, B, C, D
  • B, C, D, A
  • D, B, A, C
  • D, C, B, A
Show Solution

The Correct Option is D

Solution and Explanation

Step 1: Use wavelength instead:
Photon energy is inversely proportional to wavelength. So sort the waves from the longest wavelength to the shortest.

Step 2: Typical wavelengths:
Microwaves: about 1 mm to 30 cm. Infrared: about 700 nm to 1 mm. Ultraviolet: about 10 nm to 400 nm. X-rays: about 0.01 nm to 10 nm.

Step 3: Sort:
Longest wavelength gives lowest energy. So the order of rising energy is microwaves, infrared, UV, X-rays, which is D, C, B, A.

Step 4: Confirm:
This is the fourth option. The first option is the reverse of it, so it cannot be right.

Final Answer:
The order of rising energy is D, C, B, A. \[ \boxed{D, C, B, A} \]
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