NECO 2009 Physics · Question 21

Arrange the following in the order of their increasing frequency. I. Visible light II. Gamma rays III. Radio…

Question

Arrange the following in the order of their increasing frequency. I. Visible light II. Gamma rays III. Radio waves IV. Infra-red radiation V. Ultra-violet radiation

A.I, II, III, IV, V
B.II, III, IV, V, I
C.III, IV, V, I, II
D.IV, III, I. V, II
E.III, IV, I,V, II

Answer: E. III, IV, I,V, II

Explanation written with AI and checked against the answer key

Analyze the question: You are asked to arrange five types of electromagnetic waves from the lowest frequency to the highest.

Concept: All of these are electromagnetic waves. In the electromagnetic spectrum, frequency increases as wavelength decreases. The order of increasing frequency is:

Radio waves → Microwaves → Infra-red → Visible light → Ultra-violet → X-rays → Gamma rays

Solution:

Lowest frequency: Radio waves (III)
Next: Infra-red radiation (IV)
Next: Visible light (I)
Next: Ultra-violet radiation (V)
Highest frequency: Gamma rays (II)

So the order is III, IV, I, V, II.

Checking the options:

A: starts with visible light, which is wrong.
B: starts with gamma rays, the highest frequency, which is wrong.
C: III, IV, V, I, II puts ultra-violet before visible light, which is wrong.
D: starts with infra-red before radio waves, which is wrong.
E: III, IV, I, V, II matches the correct order.

Tip: Memorise the spectrum in order of increasing frequency with the phrase "Real Men In Violet Use X-ray Guns", which stands for Radio, Microwave, Infra-red, Visible, Ultra-violet, X-rays, Gamma. Reverse it for increasing wavelength.

AI can make mistakes. Report anything that looks wrong.