The Photoelectric Effect - AP Physics 2

More electrons emitted; kinetic energy unchanged. More photons increase electron quantity while frequency determines individual energy.

$\text{Frequency} \times \text{Wavelength} = c$. Wave equation $c = f\lambda$ relates electromagnetic wave properties.

$3.20 \times 10^{-19} \text{ J}$. Using conversion $1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}$.

Higher frequency increases kinetic energy. More energetic photons transfer greater kinetic energy to ejected electrons.

$V_s = 3 \text{ V}$. Maximum kinetic energy in eV numerically equals stopping potential in volts.

Hertz (Hz). Standard SI unit for oscillations per second in wave phenomena.

Reduces current to zero. Reverse voltage prevents electrons from reaching collector electrode.

No electrons are emitted. Insufficient photon energy cannot overcome the material's work function.

Increases current until saturation. Forward voltage accelerates electrons until all available electrons flow.

Joules (J). Energy units, since work function represents minimum energy required.

Planck's constant. Fundamental constant linking energy and frequency: $h = 6.626 \times 10^{-34} \text{ J s}$.

$f = 6.00 \times 10^{14} \text{ Hz}$. Using $f = c/\lambda$ with $\lambda = 500 \times 10^{-9} \text{ m}$.

Directly proportional. Higher electron kinetic energy requires proportionally higher stopping voltage.

More electrons emitted; kinetic energy unchanged. More photons increase electron quantity while frequency determines individual energy.

Increases kinetic energy of electrons. Higher frequency means more energetic photons and faster emitted electrons.

$E = 3.98 \times 10^{-19} \text{ J}$. Using $E = hf$ with $h = 6.626 \times 10^{-34} \text{ J s}$.

Increases photocurrent. More photons create greater electron flow in photoelectric circuit.

$\text{work function}$ or $\text{W}$. Standard symbols representing minimum energy for electron removal from material.

Higher frequency increases kinetic energy. More energetic photons transfer greater kinetic energy to ejected electrons.

$\text{work function} = 3 \text{ eV}$. Rearranging Einstein's equation: work function $= hf - E_k$.

$c = 3.00 \times 10^8 \text{ m/s}$. Fundamental constant for electromagnetic wave propagation in vacuum.

Minimum energy needed to remove an electron from a material. Material-specific binding energy threshold for electron emission.

Requires higher frequency light to eject electrons. Greater binding energy demands more energetic photons for electron liberation.

$\text{Frequency} \times \text{Wavelength} = c$. Wave equation $c = f\lambda$ relates electromagnetic wave properties.

$E_k = hf - \text{work function}$. Photon energy minus work function equals electron's kinetic energy.

Reduces current to zero. Reverse voltage prevents electrons from reaching collector electrode.

$f_0$. Standard notation for minimum frequency required for electron emission.

Kinetic energy of emitted electrons. Energy of motion possessed by electrons after photoemission occurs.

$hf = \text{work function}$. Threshold condition where photon energy exactly equals work function.