Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of and Betty has a speed of
Their dog, Spot, starts by Arthur's side at the same time and runs back and forth between them at 5.0 m/s. By the time Arthur and Betty meet, what distance has Spot run?
What will be an ideal response?
Answer: 100 m
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A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground started to bounce. b. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a refrigerator heated the air in the room in which the refrigerator is located. d. any of the above occurred. e. (a) or (b) occurred, but not (c).
When a hydrogen atom absorbs a photon that raises it to the n = 7 state, what is the greatest number of photons that can be emitted by that atom as it returns to the ground state?
a. 6 b. 7 c. 8 d. 14 e. The correct answer is not given.
The radioactivity due to carbon-14 measured in a piece of a wood from an ancient site was found to produce 20 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produced 160 counts per minute. The half-life of carbon-14, a beta emitter, is 5730 y. The age of the artifact is closest to A) 15,000 y. B) 23,000 y. C) 5700 y. D) 17,000 y. E) 12,000 y.
Which of the beams is due to an energetic light wave?
A) a B) b C) c D) a and c E) all of the above