Distinguish between fluorescence and phosphorescence
Fluorescence is the immediate emission of radiation, such as visible light, produced
by the absorption of other radiation of a higher frequency. Phosphorescence is the
persistent emission of light following exposure to and removal of incident radiation
from the sample.
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Which one of the following properties of the beam of light applies to a laser beam?
A) It is coherent. B) It is incoherent. C) It is diverging. D) It is converging. E) None of the other answers given is correct.
Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular accelerations of the point
a. Both are zero. c. Only the linear acceleration is zero. b. Only the angular acceleration is zero. d. Neither is zero.
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4sin(5x)cos(6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
A. 3 Hz B. 1 Hz C. 6 Hz D. 12 Hz E. 5 Hz
Consider a bus designed to obtain its motive power from a large rotating flywheel (1400. kg of diameter 1.5 m) that is periodically brought up to its maximum speed of 3600. rpm by an electric motor at the terminal
If the bus requires an average power of 12. kilowatts, how long will it operate between recharges?