A) its temperature
B) its acceleration
C) its wavelength and energy
D) the chemical composition of the object that emitted it
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A) The faster rotating star has wider spectral lines than the slower rotating star.
B) The faster rotating star will have an emission line spectrum while the slower rotating star will have an absorption line spectrum.
C) The peak of thermal emission will be at a shorter wavelength for the faster rotating star than for the slower rotating star.
D) There is no way to tell the stars apart spectroscopically,because their spectra will be identical.
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A) atomic number = 6;atomic mass number = 13
B) atomic number = 6;atomic mass number = 7
C) atomic number = 13;atomic mass number = 6
D) atomic number = 7;atomic mass number = 13
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A) The peak of the star's thermal emission tells us its temperature: Hotter stars peak at shorter (bluer) wavelengths.
B) The total amount of light in the spectrum tells us the star's radius.
C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals.
D) We can look at Doppler shifts of spectral lines to determine the star's speed toward or away from us.
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the number...View Answer
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A) Star X is moving away from us faster than Star Y.
B) Star Y is moving away from us faster than Star X.
C) Star X is hotter than Star Y.
D) Star X is moving away from us and Star Y is moving toward us.
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A) the number of peaks passing by any point each second.
B) measured in cycles per second.
C) measured in hertz (Hz) .
D) equal to the speed of the wave divided by the wavelength of the wave.
E) all of the above
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A) gravitational forces
B) electrical forces
C) magnetic forces
D) radiation pressure
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A) mostly radio waves.
B) mostly X-rays.
C) mostly ultraviolet light.
D) an equal amount of all wavelengths of light.
E) no light,because it is too hot.
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A) The atom becomes excited.
B) The atom is ionized.
C) An electron moves from an upper energy level to a lower one.
D) An electron moves from a lower energy level to an upper one.
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A) A hot object emits more X-rays than a cool object.
B) A hot object emits more radio waves than a cool object.
C) A hot object emits more total radiation than a cool object.
D) A hot object emits more total radiation per unit surface area than a cool object.
E) A hot object emits less total radiation than a cool object.
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A) A molecule does not have spectral lines due to electrons changing energy levels.
B) A molecule has additional spectral lines due to changes in its rotational and vibrational energies.
C) Molecules only have spectral lines at ultraviolet wavelengths.
D) Most atoms only have spectral lines at infrared wavelengths.
E) An atom has a wider range of spectral lines than molecules.
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The ice melts into liquid,then...View Answer
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The electrons can ha...View Answer
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