Fermat's principle could be the principle of least distance for
A) reflection.
B) refraction.
C) both of these
D) neither of these
Answer: A
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What causes the blue appearance of the planet Uranus?
A. The composition of Uranus's atmosphere is the same as Earth's atmosphere that makes the sky blue. B. Uranus's atmosphere contains methane that strongly absorbs red colors from the sunlight. C. The planet is covered by an ocean of water. D. The planet is very cold.
Calculate the energy En, in electron volts, of a hydrogen atom's electron with n = 6
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N b. 3.8 N c. 4.2 N d. 4.6 N e. 6.5 N
Suppose there are 2 moles of a gas in a container of fixed size and the average spacing of molecules in the container is 4.0 nm. If an additional 14 moles of the gas are added to the container and thermal equilibrium is established, what is the new average spacing of the molecules?
a. 2.0 nm c. 1.4 nm b. 0.50 nm d. 2.8 nm