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. ?/2.
C. ?.
D. 3?/2.
E. 2?.


Answer: C

Physics & Space Science

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Indicate whether the statement is true or false

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When the distance between a pair of stars doubles, the force between them

A) decreases by one-quarter. B) decreases by one-half. C) increases to twice as much. D) increases to four times as much. E) stays the same.

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Consider the circuit below. Switch S is closed at t = 0

What is the current through the capacitor C just after the switch is closed?

1.0 2.1 A 3.2 A 4.3 A 5.4 A 6.5 A 7.6 A 8.9 A 9.None of the above 10.Impossible to determine

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Strictly speaking, gas pressure inside an inflated stretched balloon is

A) less than air pressure outside the balloon. B) equal to air pressure outside the balloon. C) slightly greater than air pressure outside the balloon.

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