Light having a speed in vacuum of 3.0 × 108 m/s enters a liquid of refractive index 2.0. In this liquid, its speed will be
A) 6.0 × 108 m/s.
B) 3.0 × 108 m/s.
C) 1.5 × 108 m/s.
D) 0.75 × 108 m/s.
E) 0.67 × 108 m/s.
C
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Suppose you find a rock and measure that 12.5% of the original uranium-235 still remains it, while the other 87.5% has decayed into lead-207. About how old is the rock?
a. 4.5 billion years b. 1.25 billion years c. 2.8 billion years d. 2.1 billion years
The orbits of the electrons in the hydrogen atom
are a)evenly spaced. b)characterized by a principal quantum number. c)always smaller than that of the ground state. d)all at the same energy level within a given atom.
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2 m high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m. b. 1.84 × 10^?23 m. c. 1.84 × 10^?14 m. d. 1.80 × 10^?13 m. e. 2 m.
Hot, low-density gas can be detected in galactic clusters through X-ray emission. The gas is important in understanding dark matter because ____
a. dark matter is responsible for heating the gas b. dark matter must make the cluster massive enough to hold on to the hot gas c. the gas may be the source of dark matter d. the gas is clumped in empty places between galaxies where there is more dark matter e. the gas is produced by dark matter