If a source of sound is traveling toward you, the speed of the sound waves reaching you is _______________ the speed the sound waves would have had if the source were stationary
a. faster than
b. slower than
c. the same as
C
The frequency is higher, but the speed is the same.
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Which of these electromagnetic waves have the shortest wavelength?
A) radio waves B) infrared waves C) X-rays D) ultraviolet waves E) light waves
Which of the following is most easily understood to be quantized?
A) the number of eggs in an egg carton B) the amount of water in a glass C) the volume of air in a balloon D) the amount of time in an hour E) none of the above
The flow of heat in a cold soft drink will be from ______
a. the drink to the ice cubes b. the drink to the outside air c. the drink to the glass d. the ice cubes to the drink
The observed evidence we have for black holes includes
A) X-rays that are thought to come from the center of a black hole. B) visible light that is thought to come from the center of a black hole. C) temperature measurement of certain extremely cold stars that are thought to be black holes. D) X-rays that are thought to come from gases that are outside of a black hole. E) observations of certain regions of space, larger than the largest known stars, that emit no light.