Which of these was NOT a difficulty initially met in explaining the photoelectric effect?
a. The transferred kinetic energy seemed to work too quickly.
b. If light is a wave, its amplitude should have governed the energy imparted to electrons to cause their emission, and frequency should have had the effects it had.
c. Increased intensity of the light did not increase the maximum kinetic energy of emitted electrons.
d. Increased frequency of the light increased the maximum kinetic energy of the electrons.
e. Electrons could not escape from solid materials.
e
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Two stars have the same spectral type. Star X is in luminosity class III, while Star Y is in luminosity class V. Star X must be larger in radius than Star Y
Indicate whether the statement is true or false
Early in the 20th century, our galaxy was estimated to be:
A) about 100,000 ly in diameter. B) about 35,000 ly (10 kpc) in diameter. C) about 10 million ly in diameter. D) not much larger than our solar system. E) about 2.5 million ly in diameter.
A Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it need to remove 2000 J of heat from the interior of the house?
A) 105 J B) 780 J C) 340 J D) 520 J E) 130 J
Saturn's magnetic field is weaker than Jupiter's because it has less ________
Fill in the blank(s) with correct word