Question

Which has the longest wavelength?

• A. X-rays
• B. Micro waves
• C. Infrared rays
• D. Radio waves

Hint:

In the electromagnetic spectrum, radio waves have the longest wavelength, followed by microwaves, infrared, and then X-rays.

Answer 1

The Correct Option is D

Step 1: Understanding the electromagnetic spectrum.
The electromagnetic spectrum consists of waves of different wavelengths. From longest to shortest wavelength, the order is: \[ \text{Radio waves}>\text{Microwaves}>\text{Infrared}>\text{X-rays} \] Radio waves have the longest wavelength among the options.
Step 2: Conclusion.
Thus, radio waves have the longest wavelength, corresponding to option (D).