Ch 7 Atomic Structure and Periodicity Electromagnetic Radiation Light is just one form of electromagnetic radiation. Light with a frequency less than that of red light shows no photoelectric effect regardless of the intensity of the light. If the freq. is greater than or equal to that of red light, the no. of electrons ejected is proportional to the intensity of the light. The kinetic energy of the ejected electrons increases with the freq. of the light. Energy is quantized .
Light comes in packets of energy called quanta or photons .
The laser is fired and one photon is sent into the beam splitter. If the photon behaves like a particle it will take either path A or A' as it leaves the beam splitter. After the photon leaves the beam splitter the switch is triggered. It behaves as a particle with a definite path. It behaves as a wave.