Describe how Einstein used the photoelectric effect to support the particle theory of light and photons
What will be an ideal response?
He found that regardless of how intense the red light was, it would not cause a measurable output from the photocell. Yet even a weak blue or ultraviolet source would cause a flow of current from the photocell. So each photon must carry a discrete quantum of energy depending on its wavelength, with only the higher frequency photons carrying enough energy to stimulate current from the photocell.
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The electric field between two charged conducting plates is
A. Zero B. Strongest near the negative plate C. Strongest near the positive plate D. Uniform
The moon with a mass of 
kg is orbiting about the earth with a mass of 
kg at a radius of 
meters. The earth is orbiting about the sun with a mass of 
kg at a radius of 
meters. The force of gravity on the moon when it is between the earth and the sun is 
A. 
N toward the sun.
B. 
N toward the earth.
C. 
N toward the sun.
D. 
N toward the earth.
E. 
N toward the earth.
A battery is responsible for supplying a constant current to a circuit
Indicate whether the statement is true or false
A uniformly charged rod (length = 2.0 m, charge per unit length = 3.0 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle?
a. 64 N/C b. 133 N/C c. 48 N/C d. 85 N/C e. 34 N/C