A photocell is a device that operates using the photoelectric effect. What metal should be used if it is desired that the photocell operate using visible light?
A. manganese 
B. gadolinium 
C. cesium 
D. beryllium 
C. cesium
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The technique of connecting multiple telescopes together to combine the images from each telescope is known as
a. abberation. b. resolving power. c. active optics. d. adaptive optics. e. interferometry.
Collisions in Two Dimensions: A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together after the collision. What is the speed of the wreckage just after the collision?
A. 6.10 m/s B. 12.2 m/s C. 25.0 m/s D. 35.0 m/s E. 17.3 m/s
A star system can become a Type I supernova several times
Indicate whether the statement is true or false
At t = 0 the switch S is closed with the capacitor uncharged. If C = 50 ?F, ? = 20 V, and R = 4.0 k?, what is the charge on the capacitor when I = 2.0 mA?
a.
360 ?C
b.
480 ?C
c.
240 ?C
d.
600 ?C
e.
400 ?C