An atom that emits light of a certain frequency is
A) not likely to absorb that same frequency.
B) an absorber of light of the same frequency.
C) fluorescent.
D) none of the above
Answer: B
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Suppose you are sitting in a closed room that is magically transported off Earth so that, as shown in the diagram, you are accelerating through space at 9.8 m/s2. According to the equivalence principle, how will you know that you've left Earth?
A) You won't know that you've left Earth. B) by looking out the window C) by the fact that you'll become weightless D) by the fact that you'll feel yourself pressed harder against the floor
Suppose that Mercury grew to its present size in 1 million years through the accretion of particles averaging 100 g each. On average how many particles did Mercury capture each second? Note: Mercury has a mass of 3.3 × 10^23 kg and a radius of 2439 km
a. about 24 particles per second b. about 3.3 × 10^21 particles per second c. about 67 particles per second d. about 100 million particles per second e. about 100 billion particles per second
The date is September 21 and the Moon is at full
phase. An observer who sees this moon on her overhead meridian at this time a) sees the Sun setting. b) sees the Sun rising. c) cannot see the Sun. d) sees the Sun overhead.
One of the rare galaxies that is isolated in space is likely to be a(n) ____
a. starburst galaxy b. ultra luminous infrared galaxy c. dwarf galaxy d. antenna galaxy e. spiral galaxy