MCQ practice · SSC Physics Board questions · Chapter 8: Reflection of Light
Which of the following has the longer wavelength?
Think it through first, then pick an option.
- a infrared
- b red
- c ultraviolet
- d violet
Answer and explanation
Correct answer: a infrared
Infrared has a wavelength even longer than the longest visible one (red), so it is longer than red. Ultraviolet and violet have shorter wavelengths than red.
Why the other options are wrong
- b red: This is not the answer: Infrared has a wavelength even longer than the longest visible one (red), so it is longer than red. Ultraviolet and violet have shorter wavelengths than red.
- c ultraviolet: This is not the answer: Infrared has a wavelength even longer than the longest visible one (red), so it is longer than red. Ultraviolet and violet have shorter wavelengths than red.
- d violet: This is not the answer: Infrared has a wavelength even longer than the longest visible one (red), so it is longer than red. Ultraviolet and violet have shorter wavelengths than red.
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