Astronomers have found evidence that the expansion of the Universe is accelerating. Such acceleration
A. is deduced because distant galaxies are receding faster than expected from the Hubble law.
B. was predicted by the Big Bang model in cosmology.
C. is evidence for a cosmic repulsion related to the cosmological constant of relativity theory.
D. is deduced because nearby galaxies are receding faster than expected from the Hubble law.
Answer: C
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You are given two converging lenses to build a compound microscope. Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm. Which one of the two lenses would you use for the objective?
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a. 2.7 kg/m2 b. 3.6 kg/m2 c. 3.1 kg/m2 d. 4.1 kg/m2 e. 1.6 kg/m2
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