Rigel has an apparent magnitude of + 0.18 and Betelgeuse an apparent magnitude of +0.45. What can you conclude from this?
A) Betelgeuse must be closer to Earth.
B) Rigel is brighter than Betelgeuse.
C) Rigel must be closer to Earth.
D) Betelgeuse is brighter than Rigel.
E) Both stars are brighter than the full moon.
B
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A circus diver drops from a high pole into water far below. When he is half-way down
A) his potential energy is halved. B) he has gained an amount of kinetic energy equal to half his initial potential energy. C) his kinetic and potential energies are equal. D) all of the above E) none of the above
Because a refrigerator operates by a motor, leaving the refrigerator door open for hours in a closed room
A) increases room temperature. B) decreases room temperature. C) doesn't affect room temperature.
The distance between the slits in the two-slit experiment is 1.50 × 10-5 m. A beam of light of wavelength 600 nm is used and the distance between the slit and the screen is 2.00 m
What is the distance on the screen between the central bright fringe and the 4th order bright fringe? A) 0.132 m B) 0.201 m C) 0.324 m D) 0.528 m E) 0.688 m
An amount of a monatomic ideal gas is taken around the process shown. The amount of heat extracted during process B-C is:
1.10 J
2.20 J
3.15 J
4.45 J
5.60 J
6.none of the above
7.cannot be determined