1. There is an emission line released by an atomic transition that has a wavelen
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Question
1. There is an emission line released by an atomic transition that has a wavelength of 650mm. In the light from the star we observe this line at a wavelength of 660mm. this star is
A) moving away form us
B) moving toward us
C) cannot be determined
2. Which of the folowing is NOT direct evidence for the wave nature of light?
A) The images formed by mirrors and lenses
B) diffraction and interference of light when passed through slits
C) Combining Maxwell's equations in the absense of charges to obtain expressions for the eletric and magnetic fields
3. In the case of a concave mirror or converging lens, if there is a fixed image distance (such as is the case with the eye retina) and you want to move the object closer while keeping the image from being blurry, you should:
A) make the focal length larger
B) make the focal length smaller
4. Which of the following best describes a rigorous scientific definition of the temperature of a substance?
A) temperature is a measure of how the pressure is related to the number of molecules
B) temperature is a measure of how the energy is related to the number of molecules
C) temperature is a measure of how the average speed of molecules changes with energy
D) temperature is a measure of how the number of possible states changes with energy
5. Which of the following processes can do no work?
A) isothermal
B) isobaric
C) isovolumetric
D) adiabatic
6. Substance A and substance B are both monatomic ideal gasses. The atoms of substance B weigh 16 times as much as those of substance A. If the substances are at the same temp, how do the speeds of the molecule compare?
A) the speed of substance B molecules is 4 times that of substance A molecules
B) the speed of substance B molecules is 1/4 times that of substance A molecules
C) the speeds are the same
D) cannot be determined
7. Which of the following is an accurate statement?
A) if heat is added to a substance, the temp of the substance must increase
B) heat cannot be transferre between substances if they are not in contact
C) the amount of heat it takes to raise the temp of a substance by some amount is proportional to its specific heat
D) the heat flow across a material increases if its cross sectional area decreases
Explanation / Answer
1. There is an emission line released by an atomic transition that has a wavelength of 650mm. In the light from the star we observe this line at a wavelength of 660mm. this star is
A) moving away form us
B) moving toward us
C) cannot be determined
2. Which of the folowing is NOT direct evidence for the wave nature of light?
A) The images formed by mirrors and lenses
B) diffraction and interference of light when passed through slits
C) Combining Maxwell's equations in the absense of charges to obtain expressions for the eletric and magnetic fields
3. In the case of a concave mirror or converging lens, if there is a fixed image distance (such as is the case with the eye retina) and you want to move the object closer while keeping the image from being blurry, you should:
A) make the focal length larger
B) make the focal length smaller
4. Which of the following best describes a rigorous scientific definition of the temperature of a substance?
A) temperature is a measure of how the pressure is related to the number of molecules
B) temperature is a measure of how the energy is related to the number of molecules
C) temperature is a measure of how the average speed of molecules changes with energy
D) temperature is a measure of how the number of possible states changes with energy
5. Which of the following processes can do no work?
A) isothermal
B) isobaric
C) isovolumetric
D) adiabatic
6. Substance A and substance B are both monatomic ideal gasses. The atoms of substance B weigh 16 times as much as those of substance A. If the substances are at the same temp, how do the speeds of the molecule compare?
A) the speed of substance B molecules is 4 times that of substance A molecules
B) the speed of substance B molecules is 1/4 times that of substance A molecules
C) the speeds are the same
D) cannot be determined
7. Which of the following is an accurate statement?
A) if heat is added to a substance, the temp of the substance must increase
B) heat cannot be transferre between substances if they are not in contact
C) the amount of heat it takes to raise the temp of a substance by some amount is proportional to its specific heat
D) the heat flow across a material increases if its cross sectional area decreases
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