Do Now: White Boards What class and type of wave is light?

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Presentation transcript:

Do Now: White Boards What class and type of wave is light? Does light require a medium? What does this mean? At what speed does light travel? Can light go faster or slower than this? Explain.

Electromagnetic Waves Electromagnetic Waves (EM Waves) are TRANSVERSE WAVES EM Waves DO NOT require a medium EM WAVES are radiated by ALL objects at the SPEED OF LIGHT Speed of Light in vacuum = c = 3x108m/s

Electromagnetic Waves Calculate the wavelength of a radio wave traveling through outer space with a frequency of 5 x 104 Hz? Does this wavelength make sense on our table?

Aim: How do waves interact with different boundaries? HW: WS

Two types of wave sources Point Source Plane Source One point that oscillates Like a child bobbing in the pool. Produce circular waves An extended (rectangular) source that oscillates. Produce plane waves

Diffraction Diffraction is the bending of a wave around a barrier Know any examples? Consider a door cracked open, what shape does the light make? If it didn’t bend, it would be a straight column As you can see the light ‘fans out’ after it passes through the barrier

Ripple tank “A way to show wave behaviors” Point source Plane wave Angled Reflection Diffraction around a corner Single slit Double slit Doppler effect Try creating each of the different wave behaviors in your tank.

Point Source Plane wave Angled Reflection Diffraction around a corner

Constructive interference Single Slit Double slit Constructive interference Doppler effect Your own: Towards: High frequency shorter wavelength Away: Lower frequency longer wavelength Motion of source

Huygen’s Principle A wave front is made up of WAVELETS Each WAVELET is a POINT SOURCE of circular waves WAVE RAYS are lines PERPENDICULAR to wave fronts that show wave travel DIRECTION

Huygen’s Principle Barrier blocks part of a WAVE FRONT Remaining WAVELETS make a shorter WAVE WAVE RAYS are BENT around CORNERS

Single Slit Diffraction A small opening, or a SLIT, is also an obstacle The amount of diffraction depends on the slit width WIDE Slit  LESS Diffraction NARROW Slit  MORE Diffraction

SINGLE SLIT DIFFRACTION When light is diffracted, the bent light waves interfere with each other CONSTRUCTIVELY and DESTRUCTIVELY This results in a PATTERN OF LIGHT AND DARK BANDS Actual Pattern Graph of Pattern

More point sources diffracting at once We are primarly concerned with option c for the regents, but this is how waves behave!

When Waves Meet A Boundary… 1. 2. 3. Reflect Bend Around Refract

SUMMARY How does light behave when it meets an obstacle? How does slit width correlate to the amount of diffraction? If diffracted light were shown on a screen, what would you see? How is it accomplished?