Photoelectric Effect Flashcards
What is the photoelectric equation
hf = work function + maximum kinetic energy
For the photoelectric effect to occur, what must the photon have
Equal to or more energy than the work function of the metal
What does extra energy of a photon above the work function contribute to
Kinetic energy of the photoelectron
What is current
Rate of flow of charge/electron
What does potassium metal undergo
Photoemission with blue and green light but not with red light
What does the electron do when jumping between energy levels
Either absorbs or emits energy
What is the first energy level called
Ground state
What is every other energy level called
Excited state
What is the ground state
The lowest possible energy state of an atom
Always negative
What is the excited state
When an atom in the ground state absorbs energy so one of its electrons moved to a shell at a higher energy level
When are photons absorbed
When their energy is the same as a jump from one energy shell to another
OR
They have enough energy to remove the electron from the atom (ionisation)
What are photons emitted with
The energy difference between the two energy levels the electron has moved between
