If the half-life of a material is 45 years, how much of it will be left after 100 years?
A) more than 1/2
B) less than 1/2 but more than 1/4
C) more than 1/4 but less than 1/2
D) less than 1/4 but more than 1/8
E) less than 1/8
D
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A diverging lens will be prescribed by the eye doctor to correct which of the following?
a. myopia b. presbyopia c. hyperopia d. astigmatism
Most of the liquid hydrocarbons on Titan are concentrated in
A) lakes B) surface oceans C) subsurface oceans D) ponds
A uniform meter stick is freely pivoted about the 0.20-m mark. If it is allowed to swing in a vertical plane with a small amplitude and friction, what is the frequency of its oscillations?
A) 0.55 Hz B) 0.66 Hz C) 0.92 Hz D) 1.1 Hz E) 1.3 Hz
Cepheid variable stars stop pulsating when:
A) they evolve out of the instability strip of the H-R diagram. B) they enter the zero-age main sequence. C) they begin their stable lives fusing hydrogen. D) they reach the lower edge of the main sequence of the H-R diagram.