A packet, or quantum of light or any other type of electromagnetic radiation is called
a) an energy level.
b) a photon.
c) an excited state.
d) a discrete bundle.
b
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For a system undergoing an isothermal expansion, the work done on the working fluid is:
A. May be either, depending on the temperature B. Positive C. Zero D. Negative
If we could put all the asteroids together, their total mass would be
A) much less than the mass of any terrestrial planet. B) about the mass of Mercury. C) about the mass of Earth. D) greater than the mass of Earth but less than the mass of Jupiter.
A shiny, spherical, metal alien jumps out of a perfectly good airplane and skydives for a few seconds. Its photographic friend snaps photos of the sphere with a special camera that also captures the forces on the object.
This diagram shows a few of the snapshots, but they are out of order. Place them in order, from the instant it jumps out of the plane and begins free-fall until the time it attains terminal velocity. Assume that the parachute has not deployed yet. If any of the diagrams depict a situation not physically possible, omit it from the ordering.
A. L, Y, J, Q B. L, J, Q C. J, Y, L, J D. L, Q, J E. Q, Y
Suppose the velocity of waves on a particular rope under a tension of 100 N is 12 m/s. If the tension is decreased to 25 N what will be the new velocity of waves on the rope?
A. 18 m/s. B. 12 m/s. C. 6 m/s. D. 24 m/s. E. 48 m/s.