An electric toaster operating on 120 volts draws a current of 9 amperes. What is the resistance of the toaster?
13.3 ohms
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Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon. b. most lie beyond dense dust clouds. c. they have only a small surface area from which to emit. d. the peak of their thermal emission is at much shorter wavelengths than visual. e. they have only a small surface area from which to emit and the peak of their thermal emission is at much shorter wavelengths than visual.
Telescopes designed to study the earliest stages in galactic lives should be optimized for observations in
A) infrared light. B) visible light. C) radio waves. D) x-rays.
A photon emitted by an excited atom has an energy of 5 eV. What is its frequency?
The best way to use a telescope to look for life on other planets is to
a. search for absorption from nitrogen in their atmospheres. b. search for absorption from oxygen in their atmospheres. c. search for emission lines from water vapor in their atmospheres. d. search for carbon dioxide on their moons.