A planetary nebula
a. produces an absorption spectrum.
b. produces an emission spectrum.
c. is contracting to form planets.
d. is contracting to form a star.
e. is the result of carbon detonation in a 1- star.
b
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How do we know that different colors of light have different speeds in a material?
a. Because of measurements by Galileo of the speed of different colors of light. b. Because different colors reflect at different angles. c. Because the index of refraction depends on the speed of light in a material, and that index is different for different colors. d. Because Fizeau's measurements measured different colors of light to have different speeds. e. Because the colors combine to form white light.
Compound Microscope: The eyepiece of a compound microscope has a focal length of 2.50 cm, and the objective has a focal length of 1.60 cm. The two lenses are separated by 14.0 cm. The microscope is used by a person with normal eyes, having a near point at 25 cm. What is the magnitude of the magnification of the microscope?
A. 72 B. 88 C. 180 D. 219 E. 115
What is the force that keeps a main sequence star from collapsing on itself?
A) Magnetism B) Gravitation C) The strong force D) Radiation pressure E) Electron degeneration pressure
Bar One has a Young's modulus that is bigger than that of Bar Two. This indicates Bar One
a. is longer than Bar Two. b. has a greater cross-sectional area than Bar Two. c. has a greater elastic limit than Bar Two. d. is made of material that is different from Bar Two.