Coffee will cool faster when put into a saucer due to
a. conduction b. evaporation c. condensation d. a and b e. b and c
d
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A roentgen (R) is
A) 10-2 J/kg. B) 3.70 × 1010 decays/s in radium. C) the SI unit of radioactivity ( = 1 decay/s). D) the SI unit of absorbed dose = 1 J/kg = 100 rad. E) a dosage of 2.58 × 10-4 C/kg.
A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
A) 1/2 B) 1/4 C) 1/8 D) 1/16
An electric field is produced by a
A) constant magnetic field. B) changing magnetic field. C) either a constant or a changing magnetic field. D) none of the given answers
A heat engine having an efficiency of 0.20 takes in 2000 J of energy from the hot reservoir in one cycle. In the same time, how much work will it perform?
A. 0 J B. 33,333 J C. 400 J D. 1000 J E. 120 J