Double-pane windows contain nitrogen rather than air to prevent
A) gas escape.
B) thermal conduction.
C) condensation.
D) heat flow.
Answer: C
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Snell's Law: Light enters air from water. The angle of refraction will be
A. greater than the angle of incidence. B. equal to the angle of incidence. C. less than the angle of incidence.
A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate. b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. d. both go around with equal angular velocities but in opposite directions.
An electron is moving with speed 21. m/s
(a) What is its deBroglie wavelength? (b) What Diffraction Grating spacing between slits would give a 1st order maximum at 30.0°?
The pressure exerted by a gas is the result of
a. the Bernoulli effect b. molecular collisions c. Pascal's principle d. the ideal gas law e. none of the above