The ______ tags instruct a website to display different image size or formats (or no image) based on the size of the screen.
A.
B.
C.
D.
Answer: A
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How much energy must be absorbed to ionize a hydrogen atom whose electron is in the ground state (n = 1)?
a. Zero b. 1 eV c. 0.053 eV d. 13.6 eV
When we drink through a straw, the liquid is actually
1) pulled up 2) sucked up 3) pushed up by 4) atmospheric pressure. 5) reduced pressure in the straw. 6) surface tension. 7) capillarity.
The "light travel time distance" measures
A. the amount of time the sunlight takes to reach Earth. B. the distance light travels in one year. C. how far the light from a galaxy would have traveled if the Universe was not expanding. D. All of these choices are correct.
One of the strange consequences of special relativity is that
A. two events may appear simultaneous to one observer but not another. B. people moving at high speeds will feel crushed by length contraction. C. forces that are not real can be felt by some observers. D. time can move backward.