In a double-slit interference experiment, a wave from one slit arrives at a point on a screen one-half wavelength behind the wave from the other slit. What is observed at that point?
a. dark fringe
b. bright fringe
c. multicolored fringe
d. gray fringe, neither dark nor bright
Ans: a. dark fringe
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Newton's modification of Kepler's Third law allows astronomers to determine the ________ of celestial objects.
A. period B. mass C. acceleration D. distance
According to the present estimates, the Universe is about ________ years old.
A. 14 × 105 B. 14 × 107 C. 14 × 1011 D. 14 × 109
A 20 kg clock resting on the floor is to be raised by a 5.0 mm diameter rope with young's modulus 1.5 X 10^9 n/M^2. The rope goes up and over a pulley that is 2.5 m above the floor. You hold the at a point 1.5 m above the flow and pull hard enough to lift the block just off the floor. By how much does the rope stretch?
A. 3.0 mm B. 6.3 mm C. 9.3 mm D. 13 mm
Determine the charge stored by C1 when C1 = 20 ?F, C2 = 10 ?F, C3 = 30 ?F, and V0 = 18 V
a.
0.37 mC
b.
0.24 mC
c.
0.32 mC
d.
0.40 mC
e.
0.50 mC