In absolute visual magnitude, Mv, the subscript V refers to the:
A) apparent magnitude of a star observed from Earth.
B) wavelengths of light your eye can see.
C) distance between the sources of light.
D) luminosity of a star observed from Earth.
B
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Energy Levels: In making a transition from state n = 1 to state n = 2, the hydrogen atom must
A. absorb a photon of energy 10.2 eV. B. emit a photon of energy 10.2 eV. C. absorb a photon of energy 13.58 eV. D. emit a photon of energy 13.58 eV.
The vast flood deposits support the hypothesis that Mars once had much running water. Assuming that Mars did have water once, what happened to it?
What will be an ideal response?
Compared to ultraviolet waves, the frequency of infrared waves is
A) lower. B) the same. C) higher.
What is the stored energy in a 1.5-mH coil carrying a current of 4.0 A?
a. 12 × 10^-3 J c. 8.0 × 10^-3 J b. 4.0 × 10^-3 J d. 2.0 × 10^-3 J