Chapter 6 Flashcards
interference pattern
when light passes through two closely spaced slits
constructive interference
result of adding waves that are in phase
destructive interference
result of adding waves that are out of phase
speed of light (c)
3.00e8 m/s
speed of light equation
c = (wavelength)(frequency)
- (wavelength) = meters
- (frequency) = s^-1
blackbody radiation
when a solid is heated, it emits electromagnetic radiation over a wide range of wavelengths
Max Planck
suggested that radiant energy is only emitted or absorbed in discrete quantities or bundles
quantum (of energy)
smallest quantity of energy that can be emitted (or absorbed)
quantum theory formula
E = h(nu)
- E = energy in Joules
- nu = frequency
- h = Planck’s constant = 6.63e-34 Jxs
photoelectric effect
Einstein; electrons are ejected from the surface of a metal exposed to light of a certain threshold frequency
photons
Einstein proposed; light is a stream of particles
photon quantum theory equation
Photon = h(nu)
- where nu is at the threshold frequency
Heisenberg uncertainty principle
it is impossible to know simultaneously both the momentum and the position of a particle with certainty
Heisenberg uncertainty principle formula
(delta)x x (delta)p >= h/4(pi)
- (delta)x = uncertainty in position in meters
- (delta)p = uncertainty in momentum (mass x velocity)
Planck’s constant
6.63e-34 Jxs