The _____ is the circumstance that the primordial background radiation seems much more isotropic than can be explained by the standard big bang theory
A) horizon problem
B) flatness problem
C) density problem
D) curvature problem
A
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Which two planets are known as ice giants?
A. Earth and Mars B. Jupiter and Saturn C. Uranus and Neptune D. Pluto and Charon
Huygen's principle states that
1.there is a secondary rainbow with the spectral colors reversed from the primary rainbow. 2.light has properties of both waves and particles. 3.all points on a wave front can be taken as point sources of secondary spherical wavelets which construct the new position of the wave front as time passes. 4.rainbows are a result of dispersion.
When we say charge is conserved, we mean that charge can
A. be saved, like money in a bank B. take equivalent forms C. be created or destroyed, as in nuclear reactions D. only be transferred from one place to another
What happens to the properties of elements across any period of the periodic table?
A) The elements tend to become more metallic in nature since they are increasing in atomic number. B) The elements get much larger in size because of the addition of more protons and electrons. C) The properties of the elements gradually change across any period of the periodic table. D) All of the above are true.