The least important power of a telescope is _____.
A) magnifying power
B) light-gathering power
C) resolving power
D) reflecting power
Question 2Which of the following sequences of electromagnetic radiation is arranged in the order of increasing energy?
A) Gamma rays, X-rays, infrared radiation, and radio waves
B) Radio waves, microwaves, gamma rays, and ultraviolet radiation
C) Visible light, ultraviolet radiation, X-rays, and gamma rays
D) Visible light, microwaves, radio waves, and infrared radiation
Question 3A(n)__________is a sensitive astronomical instrument that measures the brightness of individual objects very precisely.
A) photometer
B) grating
C) charge-coupled device
D) array detector
Question 4Ultraviolet radiation from a star:
A) gets almost completely absorbed before it reaches Earth's surface.
B) has a wavelength that is longer than the visible light emitted by the star.
C) has a wavelength that is shorter than the X-rays emitted by the star.
D) reaches most of Earth's surface through atmospheric windows.
Question 5In the context of the electromagnetic spectrum, which of the following types of electromagnetic radiation has the longest wavelength?
A) X-rays
B) Visible light
C) Radio waves
D) Gamma rays
Question 6The shortest wavelength of visible light is _____.
A) 300 nanometers
B) 400 nanometers
C) 500 nanometers
D) 600 nanometers
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