A light bulb operating at a dc voltage of 120 V has a resistance of 200 ?. How much power is dissipated in this bulb?
A) 100 W
B) 60 W
C) 72 W
D) 14 mW
E) 7.2 W
C
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How many galaxies are there in the part of the universe we can observe?
A. 20,000-50,000. B. 100,000-300,000. C. 50-100 billion. D. 50-100 million. E. About 10,000.
____ are located beyond the asteroid belt (3 AU) from the sun, have extremely large masses and very low densities
a. Comets b. Extrasolar planets c. Asteroids d. Terrestrial planets e. Jovian planets
A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery (a) the voltage across the capacitor is A
equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.
The transitions of an electron in the hydrogen atom to the n = 1 level result in the
a. Lyman series. b. Balmer series. c. Paschen series. d. Bohr series.