Nanometer is a unit of _____.
A) frequency
B) energy
C) mass
D) length
Question 2_____ is absorbed by a layer of ozone in Earth's atmosphere at an altitude of about 20 mi above Earth's surface.
A) Infrared radiation
B) Ultraviolet radiation
C) Microwave radiation
D) X-ray radiation
Question 3Which of the following statements is true in the context of visible light spectrum?
A) Red light has more energy than blue light.
B) Red light has a higher frequency than blue light.
C) Red light has the shortest wavelength that can be seen by the average human eye.
D) Red light has the longest wavelength that can be seen by the average human eye.
Question 4Which of the following is true of visible light?
A) Wavelength increases from violet light to red light.
B) Wavelength decreases from violet light to red light.
C) Wavelength increases from red light to orange light.
D) Wavelength decreases from blue light to green light.
Question 5Which of the following forms of electromagnetic radiation has a longer wavelength than visible light?
A) Gamma rays
B) Ultraviolet radiation
C) Infrared radiation
D) X-rays
Question 6A _____ is an electronic device consisting of a large array of light-sensitive elements used to record very faint images.
A) photometer
B) charge-coupled device
C) spectrograph
D) photographic plate
Question 7The light-gathering power of a telescope is directly proportional to the:
A) square of the diameter of the primary mirror or lens.
B) cube of the diameter of the primary mirror or lens.
C) square of the focal length of the primary mirror or lens.
D) cube of the radius of curvature of the primary mirror or lens.
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