PHOTOELECTRIC EFFECT
Experimental Apparatus
LIGHT SOURCE
CESIUM
TARGET
DETECTOR
Wavelength (nm)
200
500
1000
Target Material
Cesium
Potassium
Calcium
Unknown
Measure
Electron Velocity Readout
—
UV: <380 nm
Violet: 380–450
Blue: 450–495
Green: 495–570
Yellow: 570–590
Orange: 590–620
Red: 620–750
IR: >750 nm