One star is emitting primarily visible light, and another star is emitting primarily infrared light. Which star is hotter?
A) There is not enough information to answer the question.
B) Both stars are the same temperature.
C) The star emitting visible light is hotter.
D) The star emitting infrared light is hotter.
C) The star emitting visible light is hotter.
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The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. Which labeled transition represents an electron that absorbs a photon with 10.2 eV of energy?
A) A B) B C) C D) D E) E
Evidence for dark matter is exhibited by the
A) relatively similar speeds at which all stars in a galaxy orbit the galactic nucleus. B) speed at which galaxies orbit one another within clusters. C) degree to which galaxy clusters exhibit gravitational lensing effects. D) All of the above
A step-up transformer in an electrical circuit can step up _______.
(a) Voltage (b) Energy (c) Both of these (d) Neither of these.
Kinetic energy of a rolling object
A. Is zero B. Is the same as a non-rotating object with the same speed C. Is greater than that of a non-rotating object with the same speed D. Is less than that of a non-rotating object with the same speed