At what rate are photons emitted by a 50. W sodium vapor lamp? (Assume that the lamp's light is monochromatic and of wavelength 589. nm.)
What will be an ideal response?
1.48 × 1020 per second
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A cluster with a lot of Type O and B stars, but no bright K or M stars, is very
A) faint. B) poor in heavy elements. C) young. D) old. E) densely packed.
A bass fiddle is louder than a harp because of its
A) thicker strings. B) sounding board. C) lower pitch. D) all of the above E) none of the above
Which of the following general statements about light and Earth's atmosphere is not true?
A) X-rays from the Sun are absorbed in the thermosphere. B) Visible light from the Sun is absorbed in the exosphere. C) Ultraviolet from the Sun is absorbed in the stratosphere. D) Infrared light emitted by Earth itself is absorbed in the troposphere.
Which quantum number denotes a "shell" and which a "subshell"?
A) mL and ms B) L and mL C) L and s D) n and L E) L and ms