Gravitational lensing is caused by ____
a. refraction of light through hot intracluster gas
b. stimulated emission of light passing through dark matter
c. acceleration of photons by supermassive black holes
d. scattering of photons off of thin intergalactic dust
e. bending of light rays due to the curvature of space-time around a mass
e
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The atmosphere of ____________________ contains acid compounds including sulfuric and hydrochloric acid
Fill in the blank(s) with correct word
Uranus and Neptune do not contain liquid metallic hydrogen because they
a. are not massive enough. b. do not contain enough hydrogen. c. rotate too slowly. d. are too far from the Sun. e. have magnetic fields that are much too weak.
The Curiosity rover has detected evidence of what kind(s) of chemical activity in Mars' soil?
A) organic carbon chemistry B) helium and hydrogen C) photosynthesis D) water, sulfur and chlorine-containing minerals E) minerals containing sulfur or produced by reactions with sulfuric acid
Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on
flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength ? = 550 nm, a wavelength which is near the middle of the visual spectrum.