Light waves are
A) beams of moving electrons and other charged particles.
B) beams of moving atoms.
C) traveling disturbances in an electromagnetic field.
D) traveling disturbances in the ether.
E) traveling disturbances in the air.
C
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In a nonlinear elastic material, the ratio of the increment in applied stress to the increment in strain measured at the total strain is the _____________modulus.
Fill in the blank(s) with the appropriate word(s).
What evidence is there for scientists to believe Uranus has some internal heat?
a. active volcanoes spewing methane gas and ash b. convection in the fluid mantle driving the dynamo effect c. a molten metallic core d. craters on the surface that are small and filled by lava e. a severe axis tilt leads to more absorption of heat from the Sun
Applications to Astronomy: A white dwarf star with a mass equal to that of the sun is about the size of
A. the sun. B. the earth. C. a basketball. D. a proton.
Which has the greater density?
A) a cup-full of fresh water B) a lake-full of fresh water C) both the same D) need more information