The ultraviolet catastrophe is a catastrophe because
A) human vision cannot detect ultraviolet light directly.
B) Wien's law predicts an infinite intensity of radiation at small wavelengths.
C) Wien's law predicts an infinite intensity of radiation at large wavelengths.
D) ultraviolet light will not produce electrons by the photoelectric effect.
B
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During nuclear fusion, four hydrogen nuclei fuse into how many helium?
a. one b. eight c. three d. four e. two
A(n) ________ spiral galaxy has a very bright active nucleus with violent motions in the interstellar gas
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If an electric toaster rated at 110 V is accidently plugged into a 220-V outlet, the current drawn by the toaster will be
A) half its normal value. B) the same as its normal value. C) twice its normal value. D) none of the above
A particle (q = 3.0 mC, m = 20 g) has a speed of 20 m/s when it enters a region where the electric field has a constant magnitude of 80 N/C and a direction which is the same as the velocity of the particle. What is the speed of the particle 3.0 s after it enters this region?
a. 68 m/s b. 44 m/s c. 56 m/s d. 80 m/s e. 36 m/s