Question

On the basis of the size of the waves and frequency, arrange the following energy waves in correct sequence in Electromagnetic Spectrum.
(A). Infrared rays
(B). Microwaves, Radio waves
(C). Gamma rays, X-rays
(D). Ultraviolet rays, Visible rays
Choose the correct answer from the options given below:

• A. (C), (A), (D), (B).
• B. (C), (D), (A), (B).
• C. (C), (B), (D), (A).
• D. (D), (C), (A), (B).

Hint:

A useful mnemonic to remember the order of the EM spectrum from longest wavelength to shortest (lowest energy to highest) is: "Raging Martians Invaded Venus Using X-ray Guns" (Radio, Microwave, Infrared, Visible, UV, X-ray, Gamma). The question asks for the reverse order.

Answer 1

The Correct Option is B

 

Step 1: Understanding the Concept: 
The question asks to arrange different types of electromagnetic radiation in the correct order as they appear in the electromagnetic (EM) spectrum. In the EM spectrum, wavelength and frequency are inversely related (higher frequency means shorter wavelength and higher energy). The standard convention is to list them in order of increasing wavelength or decreasing frequency/energy. Let's arrange them by decreasing energy. 
 

Step 2: Detailed Explanation: 
The order of the electromagnetic spectrum from highest energy/frequency (shortest wavelength) to lowest energy/frequency (longest wavelength) is: 
\[\begin{array}{rl} 1. & \text{Gamma rays} \\ 2. & \text{X-rays} \\ 3. & \text{Ultraviolet (UV) rays} \\ 4. & \text{Visible light} \\ 5. & \text{Infrared (IR) rays} \\ 6. & \text{Microwaves} \\ 7. & \text{Radio waves} \\ \end{array}\]

Now let's place the given groups into this sequence: 
\[\begin{array}{rl} \bullet & \text{(C) Gamma rays, X-rays: These have the highest energy and shortest wavelengths. This group comes first. } \\ \bullet & \text{(D) Ultraviolet rays, Visible rays: This group comes after X-rays, having less energy. } \\ \bullet & \text{(A) Infrared rays: This group comes after visible light, having even lower energy. } \\ \bullet & \text{(B) Microwaves, Radio waves: These have the lowest energy and longest wavelengths. This group comes last. } \\ \end{array}\] The correct sequence is (C), (D), (A), (B). 
 

Step 3: Final Answer: 
The correct arrangement of the energy waves in the electromagnetic spectrum is (C), (D), (A), (B).