The radiation emitted from a star has a maximum intensity at a wavelength of 500 nm. What is the temperature of this star?
a. 6,000 K
b. 5,000 K
c. 1.5 × 10^9 K
d. 500 K
e. 10,000 K
a
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The resolution of Olbers' paradox suggests that it gets dark at night because
a. the universe is not infinite in age. b. the universe is static. c. the universe is closed. d. a and b e. all of the above
A monochromatic light source emits a wavelength of 403 nm in air. When passing through a liquid, the wavelength reduces to 363 nm. What is the liquid's index of refraction?
a. 1.23 b. 1.05 c. 1.11 d. 1.90 e. 1.81
If the entire history of the Earth was scaled to a time line the length of a football field, human civilization would occupy what proportion of the field?
A) a sliver no thicker than a piece of paper B) a silver no thicker than an atom C) about a quarter of the field D) about a half of the field
What happens because of the formation of atoms?
A.) Nucleosynthesis. B.) Formation of protons. C.) Formation of quarks. D.) The cosmic microwave background is produced. E.) The Universe starts to contract.