What are scientists' best guess(es) for the requirement(s) of life?
A) a source of materials (nutrients) B) energy to fuel the activities of life
C) liquid water D) all of the above
D
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What is the difference between a hot Jupiter and a cold Jupiter?
A) Hot Jupiters have fusion reactions; cold Jupiters do not. B) Hot Jupiters orbit close to the parent stars; cold Jupiters do not. C) Hot Jupiters radiate more energy than they receive from their star; cold Jupiters do not. D) Hot Jupiters have observed volcanoes; cold Jupiters do not. E) Hot Jupiters were an exciting discovery; cold Jupiters were not.
A diver shines light up to the surface of a smooth pond at a 10° angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of
A) less than 10°. B) 10°. C) more than 10°.
A tectonic ridge appears to connect points 3a and 3b, crossing several craters. From its appearance, we can conclude that it must have formed
A) before the area was cratered. B) after the area was cratered. C) at the same time the area was cratered.
Photon A has twice the momentum of photon B as both of them are traveling in vacuum. Which statements about these photons are correct? (There could be more than one correct choice.)
A) Photon A is traveling twice as fast as photon B. B) Both photons have the same speed. C) Both photons have the same wavelength. D) The wavelength of photon A is twice as great as the wavelength of photon B. E) The wavelength of photon B is twice as great as the wavelength of photon A.