Question

Correct sequence of electromagnetic radiation in order of increasing frequency.
• [A.] Microwave
• [B.] Radio wave
• [C.] Visible light
• [D.] X-ray
• [E.] Gamma rays Choose the correct answer from the options given below :

• A. E, D, C, A, B
• B. B, A, C, D, E
• C. A, C, D, E, B
• D. A, B, C, D, E

Hint:

Electromagnetic spectrum from low frequency to high frequency: \[ \text{Radio} \rightarrow \text{Microwave} \rightarrow \text{IR} \rightarrow \text{Visible} \rightarrow \text{UV} \rightarrow \text{X-ray} \rightarrow \text{Gamma ray} \]

Answer 1

The Correct Option is B

Concept: Electromagnetic waves are arranged in the electromagnetic spectrum according to:
• Frequency
• Wavelength
• Energy Important relation: \[ c=f\lambda \] where:
• \(c\) = speed of light
• \(f\) = frequency
• \(\lambda\) = wavelength As frequency increases:
• Wavelength decreases
• Energy increases The standard order of electromagnetic waves from lowest frequency to highest frequency is: \[ \text{Radio waves} \rightarrow \text{Microwaves} \rightarrow \text{Infrared} \rightarrow \text{Visible light} \rightarrow \text{Ultraviolet} \rightarrow \text{X-rays} \rightarrow \text{Gamma rays} \]

Step 1: Identify the lowest frequency radiation. Among the given radiations:
• Radio waves have the lowest frequency. Thus: \[ \text{First} = B \]

Step 2: Determine the next higher frequency region. Microwaves possess frequency greater than radio waves but smaller than visible light. Therefore: \[ \text{Second} = A \]

Step 3: Place visible light. Visible light has frequency higher than microwaves and lower than X-rays. Thus: \[ \text{Third} = C \]

Step 4: Place X-rays and gamma rays. Among all listed radiations:
• X-rays have very high frequency.
• Gamma rays have the highest frequency. Therefore: \[ D \rightarrow E \]

Step 5: Write complete increasing order. Hence the correct sequence is: \[ B, A, C, D, E \] That is: \[ \text{Radio wave} \rightarrow \text{Microwave} \rightarrow \text{Visible light} \rightarrow \text{X-ray} \rightarrow \text{Gamma rays} \]

Step 6: Write the final answer. Therefore, the correct option is: \[ \boxed{(B)\ B, A, C, D, E} \]