When a central dark fringe is observed in reflection in a circular interference pattern, waves reflected from the upper and lower surfaces of the medium must have a phase difference, in radians, of
a. 0.
b. p/2.
c. p.
d. 3p/2.
e. 2p.
C
Physics & Space Science
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In the critical universe now proposed, the ratio of matter/energy is about:
A) 50:50. B) 27:73. C) 75:25. D) 10:90. E) 95:5.
Physics & Space Science
An astronaut is in equilibrium when he is positioned 140 km from the center of asteroid X and 581 km from the center of asteroid Y, along the straight line joining the centers of the asteroids. What is the ratio of the masses X/Y of the asteroids?
A) 0.0581 B) 17.2 C) 0.241 D) 4.15
Physics & Space Science
You carry a 20-N box 5 m horizontally across a room. The work you do is 100 N-m
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
The Appalachian Mountains in the eastern United States are examples of ______________ mountains
Fill in the blank(s) with correct word
Physics & Space Science