In a plane wave, the wavefronts are
a. circular
b. flat
c. parallel
d. perpendicular to the direction of propagation
B, C, D
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An efficient step-up transformer boosts
A) energy. B) power. C) voltage. D) all of the above E) none of the above
What is Olbers' paradox, and what is its resolution?
What will be an ideal response?
Light of wavelength 500 nm is incident on a thin sheet of plastic film (n= 1.50 ) in air. What is the thinnest the sheet can be so that the reflected light from the surfaces undergoes constructive interference?
A) 50 nm B) 250 nm C) 333 nm D) 167 nm E) 83 nm
How does the macroscopic motion of a paper airplane affect the motion of the atoms that make up the piece of paper?
a. It has no significant effect. b. The random movement of the atoms that make up the paper is replaced by orderly movement in the direction the airplane is moving. c. The atoms all move in opposition to the direction the airplane is flying. d. The atoms continue to move randomly but in addition each has an added velocity contribution in the direction the airplane is flying. e. The motion in the opposite direction of the airplane no longer occurs.