In which case will the woman see a rainbow of color interrupted by a few dark absorption lines?
A) Case 1
B) Case 2
C) Case 3
D) Case 4
B) Case 2
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What makes a transition from a higher energy state to a lower energy state when a photon is emitted by an atom?
a) electron b) proton c) photon d) graviton e) neutron
Two cars that have the same mass are moving around a circular track at the same constant speed. The track is perfectly level. If car 1 is at the inner edge of the track and car 2 is at the outer edge, then
A. the frictional force on car 1 is greater than the frictional force on car 2. B. the frictional force on car 1 is less than the frictional force on car 2. C. the frictional force on both cars is zero. D. the frictional forces on both cars are equal and greater than zero.
What observations indicate the presence of dust in the interstellar medium?
What will be an ideal response?
Two red stars have surface temperatures of 3000 K, but Star A's luminosity is about 5% of the Sun's and Star B's luminosity is about 32,000 times the luminosity of the Sun. How much bigger is star B than star A?
A) They are the same size. B) Star B's radius is about 16 times larger than star A's radius. C) Star B's radius is about 800 times larger than star A's radius. D) Star B's radius is about 640,000 times larger than star A's radius. E) This cannot be determined from the information given.