Which of the following radiations has it's frequency lower than that of infrared radiation?

Step 1: Analyze the question We need the radiation whose frequency is lower than infrared. This is about the electromagnetic spectrum.

Step 2: Recall the concept All electromagnetic waves travel at the speed of light, c = fλ. So a longer wavelength means a lower frequency.

The spectrum, from lowest to highest frequency:

Radio waves → Microwaves → Infrared → Visible light → Ultraviolet → X-rays → Gamma rays

Step 3: Compare each option with infrared

• A. Ultraviolet rays: higher frequency than infrared (they are beyond visible light).
• B. Gamma rays: the highest frequency of all.
• C. X-rays: higher frequency than ultraviolet, so higher than infrared.
• D. Radio waves: the lowest frequency and the longest wavelength, so lower than infrared.

Step 4: Answer Only radio waves lie below infrared in frequency.

Tip: Remember the order with the phrase "Raging Martians Invaded Venus Using X-ray Guns": Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma. Anything to the left of infrared has a lower frequency, and anything to the right has a higher frequency.