Two slits are illuminated with red light (? = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maximum?
a. 0.94
b. 0.92
c. 0.96
d. 0.98
e. 0.99
a
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Cleavage
What will be an ideal response?
If an equivalent amount of work is done in a shorter period of time
A. more power is required B. the same amount of power is required C. less power is required
When you throw a ball, the work you do to accelerate it equals the kinetic energy the ball gains. If you do twice as much work when throwing the ball, does it go twice as fast?
a) Yes. Twice as much work will give the ball twice as much kinetic energy. Since KE is proportional to the speed, the speed will double as well. b) Yes. Twice as much work will give the ball four times as much kinetic energy. Since KE is proportional to the speed squared, the speed will be the square root of 4, or twice as fast. c) No. Twice as much work will give the ball twice as much kinetic energy. But since KE is proportional to the speed squared, the speed will be ?2 times larger. d) No. Twice as much work will give the ball four times as much kinetic energy. Since KE is proportional to the speed, the speed will be four times larger.
RMS and Peak Quantities: The current through a 50-? resistor is I = (0.80 A) sin(240t), where t is measured in seconds. What is the rms current?
A. 0.57 A B. 0.80 A C. 1.1 A D. 1.6 A