What is the magnitude of the potential difference across the 20-? resistor?
a.
3.2 V
b.
7.8 V
c.
11 V
d.
5.0 V
e.
8.6 V
b
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Intensity of Sound: A certain factory whistle can be heard up to a distance of 9.8 km. Assuming that the acoustic output of the whistle is uniform in all directions, at what distance from the factory is the intensity level of the whistle sound equal to 25 dB? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 550 m B. 660 m C. 830 m D. 940 m E. 1100 m
Which of the following hypothetical observations would contradict current understanding of the nature of white dwarfs?
A) discovery of a white dwarf with a mass of 1.5 MSun B) discovery of a white dwarf with a surface temperature of 6000 K C) discovery of a white dwarf at the center of a planetary nebula D) discovery of a white dwarf with a 1.5 MSun mass main-sequence companion
A star that is twice as hot as another has twice the
A) Celsius temperature. B) Fahrenheit temperature. C) Kelvin temperature. D) all of the above E) none of the above
The magnetic field of a plane progressive electromagnetic wave in a vacuum is given by Bz = Bocos(ky - ?t). What is the corresponding expression for the electric field?
A) Ex = cBosin(ky - ?t) B) Ex = - cBocos(ky - ?t) C) Ez = cBosin(ky - ?t) D) Ex = cBocos(ky - ?t) E) Ex = - cBosin(ky - ?t)