Question

Electro-magnetic wave of minimum frequency is :

• A. Ultraviolet rays
• B. X-rays
• C. Gamma (\(\gamma\)-) rays
• D. Micro waves

Hint:

Use a mnemonic to remember the order of the EM spectrum. One popular mnemonic is: "Raging Martians Invaded Venus Using X-ray Guns" (Radio, Microwaves, Infrared, Visible, Ultraviolet, X-ray, Gamma).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is ordered by frequency (or wavelength). We need to identify which of the given options has the lowest frequency.
Step 2: Key Formula or Approach:
Recall the order of the electromagnetic spectrum. The standard order from lowest frequency (longest wavelength) to highest frequency (shortest wavelength) is:
Radio waves \(\to\) Microwaves \(\to\) Infrared \(\to\) Visible Light \(\to\) Ultraviolet \(\to\) X-rays \(\to\) Gamma rays.
Step 3: Detailed Explanation:
We are given the following options:
(A) Ultraviolet rays
(B) X-rays
(C) Gamma rays
(D) Micro waves
Comparing their positions in the electromagnetic spectrum:
Gamma rays have the highest frequency.
X-rays have a lower frequency than gamma rays.
Ultraviolet rays have a lower frequency than X-rays.
Microwaves have a lower frequency than ultraviolet rays.
Therefore, among the given choices, microwaves have the minimum frequency.
Step 4: Final Answer:
The electromagnetic wave with the minimum frequency among the options is Micro waves.