What is the wavelength of the K? line for Mercury?
A) 5.38 × 10-12 m B) 1.94 × 10-11 m C) 1.85 × 10-11 m D) 3.02 × 10-12 m
B
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If the distance between us and a star is doubled, with everything else remaining the same, the luminosity
A) is decreased by a factor of four, and the apparent brightness is decreased by a factor of four. B) is decreased by a factor of two, and the apparent brightness is decreased by a factor of two. C) remains the same, but the apparent brightness is decreased by a factor of two. D) remains the same, but the apparent brightness is decreased by a factor of four. E) is decreased by a factor of four, but the apparent brightness remains the same.
Jupiter is slowly shrinking through gravitational contraction today
Indicate whether the statement is true or false
Which has the highest frequency?
A) red light. B) green light. C) blue light. D) all the same
Most coal deposits were formed in the
A) Cenozoic era. B) Mesozoic era. C) Paleozoic era. D) Precambrian era.