In 1992, COBE observations revealed
A) there are small ripples in the microwave background, the seeds of galaxies.
B) that the universe had less than the critical density, so was open.
C) the dark matter in the universe is normal (baryonic), so the universe is closed.
D) the existence of dark energy.
E) the microwave background radiation is not isotropic, but centered on Virgo.
A
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If the lens in a person's eye is too highly curved, this person is suffering from
A) farsightedness. B) spherical aberration. C) astigmatism. D) chromatic aberration. E) nearsightedness.
Water has a specific heat value of ______________
Fill in the blank(s) with correct word
Nitrogen gas is used to harden iron by diffusing the nitrogen into BCC iron at 700°C. If the surface concentration of nitrogen is maintained at 0.1 weight percent, what is the expected concentration of nitrogen 1 mm from the surface after 10 hours? You can assume that at small values of z, erf(z) is approximately equal to z.
What will be an ideal response?
A conductor is distinguished from an insulator with the same number of atoms by the number of:
A) nearly free atoms B) electrons C) nearly free electrons D) protons E) molecules