A photovoltaic cell receives energy input primarily by
A) conduction.
B) convection.
C) radiation.
D) all of the above
Answer: C
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A meter stick having a rest mass of 1 kg moves past you. Your measurements show it to have a mass of 2 kg and a length of 1 m. How is the stick oriented, as observed by you?
A) perpendicular to its direction of motion B) parallel to its direction of motion C) It is impossible to say anything about the orientation without further information. D) Nonsense--if the stick's mass has increased to 2 kg, then it must be longer than 1 m.
What is the most abundant molecule in interstellar clouds besides molecular hydrogen?
A) ammonia B) water C) methane D) molecular helium E) carbon monoxide
The terrestrial planet cores contain mostly metal because
A) the entire planets are made mostly of metal. B) metals condensed first in the solar nebula and the rocks then accreted around them. C) metals sank to the center during a time when the interiors were molten throughout. D) radioactivity created metals in the core from the decay of uranium. E) convection carried the metals to the core.
Although electrons do not normally have precise positions, you can cause an electron to have a (fairly) precise position by
A) measuring its velocity. B) measuring both its position and velocity at an earlier time. C) measuring its position. D) measuring its momentum at an earlier time. E) measuring its wavelength.