A 75-watt lightbulb
A) creates a total of 75 joules of radiant energy during the entire lifetime of the bulb.
B) consumes 75 joules of electric energy during every second.
C) creates 75 joules of thermal energy during every second.
D) consumes a total of 75 joules of electric energy during the entire lifetime of the bulb.
E) creates 75 joules of radiant energy during every second.
B
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Exclusion Principle: The electron spin quantum number can have values of
A. -1/2, -1, 0, +1, +1/2. B. -1/2, -1, +1, +1/2. C. -1/2, 0, +1/2. D. -1/2, +1/2. E. only +1/2.
Rocks are grouped into three classes depending on how the rock was
A) formed. B) located. C) discovered. D) shaped.
This figure shows an all-sky map of the cosmic microwave background recorded by the Planck mission. What do the dark and bright variations represent?
A) regions of the sky with very slightly different density at the time the radiation was emitted B) regions of the sky with different proportions of hydrogen and helium at the time the radiation was emitted C) the present distribution of galaxies in the universe D) regions of the sky with different amounts of dark energy
A constant force is acting on an object. Which of these graphs best represents the velocity of the object?
A. 
B. 
C. 