Photons and the Photoelectric Effect

To explain the photoelectric effect, Einstein assumed that the radiant energy striking the metal surface behaves like a stream of tiny energy packets. Each packet, which is like a particle of energy, is called a photon. Extending Planck s quantum theory. 

Why is it necessary to carry out this experiment in an evacuated chamber  

Einstein deduced that each photon must have an energy equal to Planck s constant times the frequency of the light  

Calculate the energy of one photon of yellow light that has a wavelength of 589 nm. 

Analyze Our task is to calculate the energy, fj of a photon, given A = 589 nm. 

Under the right conditions, photons striking a metal surface can transfer their energy to electrons in the metal. A certain amount of energy—called the work function —is required for the electrons to overcome the attractive forces holding 

What is the source of the energy that causes electrons to be emitted from the surface  

Electrons emitted from surface by energy of photon 

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