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

Physics & Space Science

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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.

Physics & Space Science

Jupiter is slowly shrinking through gravitational contraction today

Indicate whether the statement is true or false

Physics & Space Science

Which has the highest frequency?

A) red light. B) green light. C) blue light. D) all the same

Physics & Space Science

Most coal deposits were formed in the

A) Cenozoic era. B) Mesozoic era. C) Paleozoic era. D) Precambrian era.

Physics & Space Science