For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. As the temperature
of an object increases, the wavelength of the brightest light emitted
a. increases.
b. decreases.
c. doesn't change.
d. depends on the composition of the body.
e. depends on the size of the body.
b
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Standing waves can be set up in a string when two waves that are
a. of the same frequency and amplitude, but are opposite in direction of travel, meet each other. b. of the same frequency, amplitude, and direction of travel are also 180° out of phase. c. of the same frequency, amplitude, and direction of travel meet each other. d. of the same frequency, amplitude, and velocity meet each other.
Waves that are emitted in phase from two sources will undergo constructive interference when the paths from the sources differ by
A) an odd half-integer number of wavelengths. B) a whole integer number of wavelengths. C) an odd one-third-integer number of wavelengths. D) any quarter-integer number of wavelengths. E) none of the above.
In an experiment different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. Which statement is true?
a. The number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths. b. The number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths. c. The maximum kinetic energy of the photoelectrons emitted is directly proportional to the frequency for each wavelength present. d. The maximum kinetic energy of the photoelectrons has a linear relationship with the frequency for each wavelength present. e. The maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.
Dactyl was photographed by the Galileo spacecraft. It is:
A) a moon of the asteroid Ida. B) a moon of Halley's Comet. C) one of the small moons of Jupiter, thought to be a captured asteroid. D) one of the larger asteroids found in the asteroid belt. E) an Earth-crossing asteroid.