White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye
a. True
b. False
Indicate whether the statement is true or false
True
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The temperature of black holes is estimated to be ________.
A. hotter than a white dwarf B. hotter than 1 million degrees C. less than 1 millionth of a degree D. hotter than the Sun E. Black holes do not have temperature.
Kids in elementary school get this right: Which color of light gets through red glass?
A) red B) cyan C) none of these
The number of daylight hours at 35°N is greatest during the month of
a. May. b. August. c. June. d. July.
The charge on the square plates of a parallel-plate capacitor is Q
The potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. The amount of charge on the plates is now equal to A) 4Q. B) 2Q. C) Q. D) Q/2. E) Q/4.