How can a hydrogen atom, which has only one electron, have so many spectral lines?
A. The protons in the nucleus are also giving off various light frequencies.
B. One electron can be boosted to many different energy levels.
C. The electron is able to move at various speeds.
D. The atomic radius of the hydrogen atom is relatively large.
Answer: B
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Which of the following predators avoid competition by being active at different times?
A. lions and tigers B. hummingbirds and bees C. hawks and owls D. zebras and antelopes E. lions and cheetahs
Is the rate of Earth's rotation increasing or decreasing?
A) It is increasing. B) It is decreasing. C) It is remaining relatively steady. D) It is increasing and decreasing in cyclic fashion.
This pressure zone is associated with abundant precipitation and warm temperatures
A) equatorial low B) subtropical high C) subpolar low D) polar high
Carbon monoxide ________
A) is a major component of the atmosphere B) is produced by plants during photosynthesis C) blocks oxygen transport in human blood D) is consumed by plants for photosynthesis E) causes ozone depletion