Buscar
Estás en modo de exploración. debe iniciar sesión para usar MEMORY

   Inicia sesión para empezar

level: Light

Questions and Answers List

level questions: Light

QuestionAnswer
Photoelectric equationhf = work function +Ek (max) particle energy = work function + maximum kinetic energy
Photon energyh x Frequency h = planck's constant
Particle wavelengthh / momentum h = planck's constant
Wavelength, double slitsWavelength = distance from screen x fringe spacing / distance between two slits
Diffraction gratingd 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 substancen = c/cs Refractive index = speed of light in a vacuum / speed of light in new medium
Law of refractionn1 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 angleThe 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 angleSin (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 definitionThe energy required to make an electron leave a metal
Threshold frequencyThe minimum frequency of light needed to eject an electron
Work function equationwork function = hf
Photoelectric definitionWhen a light of a certain frequency is shone onto a metal surface making electrons emit
Maximum kinetic energy for an electron in photoelectric effectMax kinetic energy = hf - work function 1/2 m x v^2
Particle momentumh / wavelength
Velocity of a particleh / (wavelength x mass) or momentum / mass
Photoelectric equationhf = work function +Ek (max) particle energy = work function + maximum kinetic energy
Definition of stopping potentialStopping 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 lightE = h x c / wavelength
What is a monochromatic light sourceA light that has one wavelength (and a narrow window of frequencies)