Light Wave or Particle Evidence Wave Properties Particle

Light Wave or Particle?

Evidence Wave Properties Particle Properties

Interference of Light When two light waves hit they ________________ each other. While they occupy the same space the waves _______ amplitudes and frequencies to produce a different wave. This is called ____________. If two _____ hit they bounce off each other. They don’t interfere like waves.

Refraction & Dispersion of Light • • When light enters glass it _____. This is called ______ How much light refracts depends on the type of _____ and the ____ of light. A particle could refract, wave theory works better. • • When _____ light enters glass the different frequencies bend differently. This causes the light to split into the ______. This is called _______. Particles wouldn’t display dispersion.

The Doppler Effect for Light When a light source is moving the frequency of light it emits changes due to this _______. A particle doesn’t do this, only a _______.

Diffraction of Light You get a _________, called a ____________ pattern. Basically the light _____ as it _____ the slit causing an alternating series of constructive and destructive interference. A particle wouldn’t do this. If I fire this laser through a small slit, what will I see on the wall when it hits?

The Photoelectric Effect • When light hits certain metals it causes the metal to eject _______. • Treating light as a wave tells us that the _____ the light, the more electrons get ejected or the electrons get ejected at a ________. • This would be true if it wasn’t_____!!! • It turns out the _______ of the light is what determines whether or not electrons are ______ from the metal. • This suggests that light travels in _____ or packets called _______ which behave like particles.

The Ultraviolet Catastrophe • A blackbody radiator absorbs all electromagnetic radiation that hits it and emits own electromagnetic radiation based on its ______. • Wave theories predict that the wavelengths of electromagnetic waves a blackbody will emit should follow the relationship shown by the __________ in the graph. • It turns out that experiments show that the wavelength of electromagnetic waves emitted by a blackbody actually follow the _______ shown in the graph called blackbody curves. • Which curve is determined by the temperature of the blackbody.

THE ULTRAVIOLET CATASTROPHE This also suggests that light travels in _______ or packets called ______ which behave like ____.

THE DUAL NATURE OF LIGHT