When we say energy levels in an atom are discrete, we mean that their energy levels are well defined and
A) separate from one another.
B) separated by equal energy increments.
C) continuous.
D) private.
Answer: A
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O-type stars in our galaxy are
A) very common, making up about 50% of the total B) fairly common (several percent) C) very rare (less than 1%) D) the most common type of stars in our galaxy (75% or more)
Wave Characteristics: How far does a beam of light travel in 2.0 ms? (c = 3.0 × 108 m/s)
A. 6.0 × 105 m B. 0.66 × 105 m C. 90 m D. 70 m E. 60 m
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A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?
A) 240 ? B) 6.0 × 10-3 ? C) 120 ? D) 100 ? E) 8.0 × 10-3 ?