Doubling the wavelength of a photon would ______________
a. reduce its energy to one-half
b. double its energy
c. triple its energy
d. not change
a
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Ohm's Law: The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
Fill in the blank(s) with the appropriate word(s).
Which of the following best describes how and why x-ray telescopes differ from visible light telescopes?
A) X-ray telescopes use grazing incidence mirrors because x-ray photons will penetrate a normal mirror. B) X-ray telescopes must be much larger because of the small number of x-ray photons. C) X-ray telescopes cannot do spectroscopy because all x-ray photons have the same wavelength. D) X-ray telescopes have to be built with very thick mirrors because x-ray photons will penetrate a thin mirror. E) X-ray telescopes do not use mirrors because x-ray photons cannot be focused.
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is __________
Fill in the blank(s) with correct word
Two bodies can be in thermal equilibrium with one another when they are at the same temperature even if they
a. absorb different quantities of thermal energy from their surroundings in equal time intervals. b. have different masses. c. have different volumes. d. have any of the properties listed above. e. have any of the properties listed above and one of them is contact with a third body at a different temperature.