| Photoelectric equation | hf = work function +Ek (max)
particle energy = work function + maximum kinetic energy |
| Photon energy | h x Frequency
h = planck's constant |
| Particle wavelength | h / momentum
h = planck's constant |
| Wavelength, double slits | Wavelength = distance from screen x fringe spacing / distance between two slits |
| Diffraction grating | d x sin (theta) = n x (lambda)
Slit separation x sin(angle to maximum point) = Which diffraction number it is (e.g 1,2,3) x wavelength |
| Refractive index of a substance | n = c/cs
Refractive index = speed of light in a vacuum / speed of light in new medium |
| Law of refraction | n1 x sin1 (theta) = n2 x sin2 (theta)
refractive index of first material x sin1 (theta) (to the normal which is perpendicular to the glass) = refractive index of second material x sin2 (theta) |
| Definition of critical angle | The greatest angle at which a ray of light, travelling in one medium, can strike the boundary between that medium and a second of lower refractive index without being totally reflected within the first medium. |
| Critical angle | Sin (theta (crit angle)) = (n2/n1) n1>n2
sin( angle to normal) = refractive index of second material/refractive index of first material
as long as the first is larger then the second |
| Work function definition | The energy required to make an electron leave a metal |
| Threshold frequency | The minimum frequency of light needed to eject an electron |
| Work function equation | work function = hf |
| Photoelectric definition | When a light of a certain frequency is shone onto a metal surface making electrons emit |
| Maximum kinetic energy for an electron in photoelectric effect | Max kinetic energy = hf - work function
1/2 m x v^2 |
| Particle momentum | h / wavelength |
| Velocity of a particle | h / (wavelength x mass)
or
momentum / mass |
| Photoelectric equation | hf = work function +Ek (max)
particle energy = work function + maximum kinetic energy |
| Definition of stopping potential | Stopping potential is the potential difference needed to stop the fastest moving electron in a photo cell experiment |
| Photon energy with planck's constant, wavelength and speed of light | E = h x c / wavelength |
| What is a monochromatic light source | A light that has one wavelength (and a narrow window of frequencies) |
