After rolling half-way down an incline, a marble's kinetic energy is
A) less than its potential energy.
B) greater than its potential energy.
C) the same as its potential energy.
Answer: C
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The Lyman series of hydrogen is made up of those transitions made from higher levels to n = 1 . If the fifth line in this series has a wavelength of 94 nm, what is the wavelength of the sixth line?
a. 106 nm b. 93 nm c. 117 nm d. 102 nm e. 124 nm
The coil of a generator is rotated twice as fast keeping all other factors constant. What happens to the value of the maximum induced emf?
A) It stays the same. B) It is reduced by a factor of 2. C) It is increased by a factor of 2. D) It is increased by a factor of 4. E) It is reduced by a factor of 4.
A 6.0-? and a 12-? resistor are connected in parallel across an ideal 36-V battery. What power is dissipated by the 6.0-? resistor?
A) 48 W B) 220 W C) 490 W D) 24 W
Absolute visual magnitude is
a. the apparent magnitude of a star observed from Earth. b. the luminosity of a star observed from a distance of 1000 pc. c. the apparent magnitude of a star observed from a distance of 10 pc. d. the luminosity of a star observed from Earth. e. the apparent magnitude of a star observed from a distance of 10 pc and the luminosity of a star observed from Earth.