A fused combination of a diverging and converging lens pair, each made from a different index of refraction glass, is used to reduce the occurrence of which of the following effects?
a. mirages
c. chromatic aberration
b. light scattering
d. spherical aberration
C
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Which is the correct order of planetary object class during their formation?
a. planetesimals, protoplanets, and planets b. planets, planetesimals, and protoplanets c. planetesimals, planets, and planetettes d. protoplanets, planetesimals, and planets e. planetesimals, planetettes, and planets
Every atom has a _________, with at least one positively charged _____ and, in most atoms, at least one _____ that has no charge.
A. Nucleus; neutron; proton B. Nucleus; proton; neutron C. Proton; nucleus; neutron D. Proton; neutron; nucleus
Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
A) smaller than the magnitude of the change in momentum of the larger mass, but not zero. B) zero. C) exactly equal to the magnitude of the change in momentum of the larger mass. D) larger than the magnitude of the change in momentum of the larger mass. E) There is not enough information to answer the question.
What would the geometry of a universe at the critical density be?
What will be an ideal response?