# Digital Image Processing Questions and Answers – Light and the Electromagnetic Spectrum

This set of Digital Image Processing Multiple Choice Questions & Answers (MCQs) focuses on “Light and the Electromagnetic Spectrum”.

1. Of the following, _________ has the maximum frequency.
a) UV Rays
b) Gamma Rays
c) Microwaves

Explanation: Gamma Rays come first in the electromagnetic spectrum sorted in the decreasing order of frequency.

2. In the Visible spectrum the ______ colour has the maximum wavelength.
a) Violet
b) Blue
c) Red
d) Yellow

Explanation: Red is towards the right in the electromagnetic spectrum sorted in the increasing order of wavelength.

3. Wavelength and frequency are related as : (c = speed of light)
a) c = wavelength / frequency
b) frequency = wavelength / c
c) wavelength = c * frequency
d) c = wavelength * frequency

Explanation: It is usually written as wavelength = c / frequency.

4. Electromagnetic waves can be visualised as a
a) sine wave
b) cosine wave
c) tangential wave
d) None of the mentioned

Explanation: Electromagnetic waves are visualised as sinusoidal wave.

a) lumens
b) watts
c) armstrong
d) hertz

Explanation: Radiance is the total amount of energy that flows from the light source and is measured in Watts.

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6. Which of the following is used for chest and dental scans?
a) Hard X-Rays
b) Soft X-Rays
d) Infrared Rays

Explanation: Soft X-Rays (low energy) are used for dental and chest scans.

7. Which of the following is impractical to measure?
a) Frequency
c) Luminance
d) Brightness

Explanation: Brightness is subjective descriptor of light perception that is impossible to measure.

8. Massless particle containing a certain amount of energy is called
a) Photon
b) Shell
c) Electron
d) None of the mentioned

Explanation: Each bundle of massless energy is called a Photon.

9. What do you mean by achromatic light?
a) Chromatic light
b) Monochromatic light
c) Infrared light
d) Invisible light

Explanation: Achromatic light is also called monochromatic light.(Light void of color)

10. Which of the following embodies the achromatic notion of intensity?
a) Luminance
b) Brightness
c) Frequency

Explanation: Brightness embodies the achromatic notion of intensity and is a key factor in describing color sensation.

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To practice all areas of Digital Image Processing, here is complete set of 1000+ Multiple Choice Questions and Answers.

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