The star Betelgeuse appears red; the star Rigel appears blue. What accounts for this difference?
a. Betelgeuse and Rigel have different chemical compositions
b. Betelgeuse is moving away from Earth, Rigel is moving toward Earth.
c. Betelgeuse is moving toward Earth, Rigel is moving away from Earth.
d. The surface of Betelgeuse is hotter than the surface of Rigel.
e. The surface of Betelgeuse is cooler than the surface of Rigel.
e
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What observational evidence supports the hypothesis that elliptical galaxies are born from relatively dense protogalactic clouds?
A) Elliptical galaxies have stars packed more densely together than spiral galaxies. B) Elliptical galaxies are generally larger than spiral galaxies. C) Even very distant elliptical galaxies tend to lack young, blue stars, indicating their stars formed early and rapidly. D) Elliptical galaxies have more and denser gas than spiral galaxies. E) The stars in elliptical galaxies are denser than those in spiral galaxies.
You could determine the index of refraction for visible light of a dark but reflective medium such as black glass by measuring the
a. angles of incidence and refraction. b. angle of reflection for an arbitrary angle of incidence. c. angle at which reflected light is completely polarized. d. smallest angle at which X-ray diffraction occurs in the glass. e. smallest angle at which diffraction occurs for visible light when a diffraction pattern is scratched onto the surface.
.0 L of an ideal nitrogen gas (N2) are at 0.00°C and 1.0 atm. The ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K, Avogadro's number is 6.022 × 1023 molecules/mol, and the ATOMIC mass of nitrogen is 14 g/mol
(a) Determine the number of moles of N2. (b) How many molecules of N2 are present? (c) What is the mass of this gas? What will be an ideal response?