One star is emitting mostly visible light, and another star is emitting mostly infrared light. Which star is hotter?
A) The temperature also depends on the radius of the star, so one can't decide based on the information provided.
B) Both stars are the same temperature.
C) The star emitting visible light.
D) The star emitting infrared light.
C) The star emitting visible light.
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A flashlight, which uses two 1.5 V batteries in series, is turned on for 2.0 minutes. If the current in the flashlight is 100 mA, what is the energy dissipated?
A. 12 J B. 9.0 J C. 72 J D. 36 J E. 18 J
The energy released when a star explodes in a supernova can be more than the nuclear fusion energy produced by the same star throughout its entire lifetime.
Answer the following statement true (T) or false (F)
When a dielectric material is introduced between the plates of a parallel plate capacitor the capacitance increases by a factor of 4. What is the dielectric constant of the material introduced between the plates?
A) 0.4 B) 1/4 C) 2 D) 4 E) None of the other choices is correct.
Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both objects continue to fall, their separation
A) increases. B) decreases. C) stays constant. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.