1.
A) radiation B) convection C) conduction D) thermal 2.
A) because there's no such thing as sound in space B) because sound waves can't travel in space, far from Earth C) because sound waves can't travel through empty space D) because outer space alters the astronaut's hearing 3.
A) the number of times a wave moves per unit of sound B) the number of times a wave vibrates per unit of time C) the distance a line travels in a certain amount of time D) the distance waves travel in a certain amount of time 4.
A) A reflecting telescope uses a convex lens to magnify an image, and a refracting telescope uses a mirror. B) A refracting telescope uses a mirror, and a reflecting telescope uses a concave lens to magnify an image. C) A refracting telescope uses a convex lens to magnify an image, and a reflecting telescope uses a mirror. D) There is no difference. 5.
Hubble Space Telescope ?A) It is a reflecting telescope, and there was a problem with the lens. B) It is a refracting telescope, and there was a problem with the mirror. C) It is a refracting telescope, and there was problem with the lens. D) It is a reflecting telescope, and there was a problem with the mirror. 6.
A) weather conditions B) mirrors C) computers D) lenses 7.
A) computers B) lasers C) mirrors D) lenses 8.
A) because they use radio waves, which do not pass freely through Earth's atmosphere due to unpredictable weather B) because they use radio waves, which pass freely through Earth's atmosphere in any weather condition C) because they use radios to help various telescope's computers communicate with each other D) because they never run out of energy
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