According to this diagram, how much more abundant is hydrogen in the universe than nitrogen?
A) Hydrogen is about 10,000 times as abundant as nitrogen.
B) Hydrogen is about 30% more abundant than nitrogen.
C) Hydrogen is about 10 times as abundant as nitrogen.
D) Hydrogen is about 4 times as abundant as nitrogen.
A) Hydrogen is about 10,000 times as abundant as nitrogen.
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Cubes of sugar, 1 cm on a side, are placed in water at 25ºC. Estimate the time before the lumps have dissolved; that is, when the sugar concentration at the lump is 10% by weight. Assume that the diffusivity of sugar into water is 6.9 x 10^-10m^2/s, the convective mass transfer coefficient is 6.4 x 10^-6m^2/s, and the self-diffusivity of sugar is 1 x 10^-5m^2/s. The density of sugar may be taken as 1500 kg/m^3.
What will be an ideal response?
Double-Slit Interference: An optical engineer needs to ensure that the bright fringes from a double-slit are 15.7 mm apart on a detector that is 1.70 m from the slits. If the slits are illuminated with coherent light of wavelength 633 nm, how far apart should the slits be?
A. 68.5 ?m B. 74.0 ?m C. 79.5 ?m D. 63.0 ?m
The most striking "cloudmark" in Jupiter's atmosphere is the
A) Great Dark Spot. B) Cassini Division. C) Great Red Spot. D) Black Hole. E) Brown Dwarf.
If the intensity of sound changes (increases) by a factor of 100, the decibel level changes by a factor of
A) log 100. B) 100. C) 20. D) 1. E) 10.