41. Which of the following has the maximum frequency?
A. UV Rays
B. Gamma Rays
C. Microwaves
D. Radio Waves
Answer: B
Gamma Rays come first in the electromagnetic spectrum sorted in the decreasing order of frequency.
42. In the Visible spectrum the ______ color has the maximum wavelength.
A. Violet
B. Blue
C. Red
D. Yellow
Answer: C
Red is towards the right in the electromagnetic spectrum sorted in the increasing order of wavelength.
43. 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
Answer: D
Wavelength and frequency are related as
c = wavelength * frequency
It is usually written as wavelength = c / frequency.
44. Electromagnetic waves can be visualized as a
A. sine wave
B. cosine wave
C. tangential wave
D. None of the mentioned
Answer: A
Electromagnetic waves are visualized as sinusoidal waves. Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
45. How is radiance measured?
A. lumens
B. watts
C. Armstrong
D. hertz
Answer: B
Radiance is the total amount of energy that flows from the light source and is measured in Watts.
46. Which of the following is used for chest and dental scans?
A. Hard X-Rays
B. Soft X-Rays
C. Radio waves
D. Infrared Rays
Answer: B
Soft X-Rays (low energy) are used for dental and chest scans. In soft x-ray contact microscopy, the image is recorded rapidly to avoid both natural and radiation-induced movement and this technique has been used to study the ultrastructural effects of electron microscopy fixatives.
47. Which of the following is impractical to measure?
A. Frequency
B. Radiance
C. Luminance
D. Brightness
Answer: D
Brightness is the subjective descriptor of light perception that is impossible to measure.
48. Massless particle containing a certain amount of energy is called
A. Photon
B. Shell
C. Electron
D. None of the mentioned
Answer: A
A massless particle containing a certain amount of energy is called a photon. Each bundle of massless energy is called a Photon.
49. What do you mean by achromatic light?
A. Chromatic light
B. Monochromatic light
C. Infrared light
D. Invisible light
Answer: B
Achromatic light is also called monochromatic light. (Light void of color). This is colorless light described by the notion of black-gray-white. Its main quality is INTENSITY or LUMINANCE, which is the quantity of light in the physics sense of energy. In contrast, BRIGHTNESS is the perceived intensity in the psychological sense.
50. Which of the following embodies the achromatic notion of intensity?
A. Luminance
B. Brightness
C. Frequency
D. Radiance
Answer: B
Brightness embodies the achromatic notion of intensity and is a key factor in describing the color sensation.
