WFU Department of Physics Wake Forest University

 

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WFU Physics Lecture Demonstrations

Stopping Potential

PIRA 7A10.30

Image:

Description:

The number of electrons released per second (the current) depends on the light intensity and frequency (color). These can be varied to find what determines the maximum kinetic energy of the electrons.

Recipe and
Location:

Photo Electric Effect Demo (3 boxes)
Demo Power Supply
Meter Stick

Section G
Section I
101 Beside Wipe Board

Video:

Streaming Video:

None

MPG Video:

None

 

Real Video:

None

Notes:

Use the gooseneck camera to show the current amplifier meter to the class. The light need to have the hood on it in order to cut the intensity of the light a bit. Plug the photoelectrometer into a volmeter using the 'meter' connections. Also plug it into the 0-5 VDC jacks of the Demo Power Supply using the 'battery' connections. You might have to switch the leads on the battery hookup to get the desired effect.

 

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Mechanics
Fluid Mechanics
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100 Olin Physical Laboratory
Wake Forest University
Winston-Salem, NC 27109-7507
Phone: (336) 758-5337, FAX: (336) 758-6142
E-mail:
wfuphys@wfu.edu