What is the physical difference between light and a radio wave?
A) Light waves have a higher frequency than radio waves.
B) Light is an electromagnetic wave while radio is a pressure wave in air.
C) Light waves have a longer wavelength than radio waves.
D) Light waves have a larger amplitude than radio waves.
E) None of the above.
A
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You discover an impact crater that is 10 kilometers across. Which of the following can you conclude?
A) It was created by the impact of an object about 1 kilometer across. B) It was created by the impact of an object about 10 kilometers across. C) It was created within the past 10 million years. D) It was created within the past 1 billion years. E) It was created by the impact of an object about 100 kilometers across.
What is the Sun mainly made of?
A) hydrogen and oxygen B) hydrogen and helium C) carbon and nitrogen D) oxygen and carbon E) nearly equal portions of all the elements
Composite _________is produced by laying fibers in random directions in a plane.
Fill in the blank(s) with the appropriate word(s).
Imagine we've discovered a planet orbiting another star at an average distance of 1 AU with an orbital period of 6 months. The planet has a moon that orbits the planet at the same distance as our Moon, but it takes 2 months to complete an orbit. What can we infer about this planet?
A) It is more massive than Earth. B) It is less massive than Earth. C) It has the same mass as Earth. D) We cannot answer the question without knowing the mass of the star. E) We cannot answer the question without knowing the mass of the moon.