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: Overview: 
The task is to order electromagnetic radiation types within the electromagnetic (EM) spectrum. Wavelength and frequency are inversely related; higher frequency means shorter wavelength and higher energy. The standard is to list them by increasing wavelength (decreasing frequency/energy). We'll order by decreasing energy. 
 

Step 2: Breakdown: 
The electromagnetic spectrum, from highest to lowest energy/frequency (shortest to 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 provided groups into this sequence: 
\[\begin{array}{rl} \bullet & \text{(C) Gamma rays, X-rays: Highest energy, shortest wavelengths; therefore, this group is first. } \\ \bullet & \text{(D) Ultraviolet rays, Visible rays: Lower energy than X-rays; this group follows. } \\ \bullet & \text{(A) Infrared rays: Lower energy than visible light; this group comes after. } \\ \bullet & \text{(B) Microwaves, Radio waves: Lowest energy, longest wavelengths; this group is last. } \\ \end{array}\] The correct sequence is (C), (D), (A), (B). 
 

Step 3: Answer: 
The correct electromagnetic spectrum wave arrangement is (C), (D), (A), (B).