The bending of light because of a speed change as it moves from one medium to another is called
a. diffraction.
b. refraction.
c. reflection.
d. the Doppler effect.
b
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The Elysium region is a _____
A) highland area on Venus B) frozen polar cap on Neptune C) volcanic plain on Mars D) geological fault on Uranus
Is this a photo of a spiral galaxy or an elliptical galaxy, and how do you know?
A) It is a spiral galaxy because we can see a dusty disk going across the center. B) It is a spiral galaxy, and we know because photos of this same galaxy from above show its spiral arms. C) It is an elliptical galaxy because it is elliptical in shape. D) It is an elliptical galaxy because it looks red/yellow in color.
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters away from the Sun. D) Earth is the size of a golf ball about 15 meters away from the Sun. E) Earth is the size of a marble about 25 miles away from the Sun.
Orion is visible on winter evenings in the northern hemisphere but not summer evenings because of
A) interference from the full Moon. B) the tilt of Earth's axis. C) the location of Earth in its orbit. D) the precession of Earth's axis. E) baseball on television.