ib chemistry on electromagnetic spectrum and wave particle duality
DESCRIPTION
IB Chemistry on Electromagnetic Spectrum and Wave Particle DualityTRANSCRIPT
http://lawrencekok.blogspot.com
Prepared by Lawrence Kok
Tutorial on Electromagnetic Radiation and Wave-Particle Duality.
Electromagnetic Spectrum
Electromagnetic spectrum ranges from Radiowaves to Gamma waves.- Form of energy- Shorter wavelength -> Higher frequency -> Higher energy- Longer wavelength -> Lower frequency -> Lower energy
Electromagnetic Spectrum
Electromagnetic spectrum ranges from Radiowaves to Gamma waves.- Form of energy- Shorter wavelength -> Higher frequency -> Higher energy- Longer wavelength -> Lower frequency -> Lower energy
Inverse relationship between- λ and fWavelength, λ - long
Frequency, f - low
Wavelength, λ - short
Frequency, f - high
Electromagnetic Spectrum
Electromagnetic spectrum ranges from Radiowaves to Gamma waves.- Form of energy- Shorter wavelength -> Higher frequency -> Higher energy- Longer wavelength -> Lower frequency -> Lower energy
Electromagnetic radiation •Travel at speed of light, c = fλ -> 3.0 x 108 m/s•Light Particle – photon have energy given by -> E = hf•Energy photon - proportional to frequency, f
Inverse relationship between- λ and fWavelength, λ - long
Frequency, f - low
Wavelength, λ - short
Frequency, f - high
Plank constant •proportionality constant bet energy and freq
Excellent video wave propagation Click here to view.
Electromagnetic Wave propagation.
Electromagnetic radiation
Electromagnetic radiation •Moving charges/particles through space •Oscillating wave like property of electric and magnetic field•Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.
Electromagnetic wave propagation
Click here to view video
Electromagnetic Wave propagation.
Wave
Electromagnetic radiation
Electromagnetic radiation •Moving charges/particles through space •Oscillating wave like property of electric and magnetic field•Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.
Electromagnetic wave propagation
wave
Wave – wavelength and frequency - travel at speed of light
Click here to view video
Electromagnetic Wave propagation.
Wave
Electromagnetic radiation
Electromagnetic radiation •Moving charges/particles through space •Oscillating wave like property of electric and magnetic field•Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.
Electromagnetic wave propagation
wave
Wave – wavelength and frequency - travel at speed of light
Violet
λ = 410nm
Red
f = c/λ = 3 x 108/410 x 10-9
= 7.31 x 1014 Hz
E = hf = 6.626 x 10-34 x 7.31 x 1014
= 4.84 x 10-19 J
λ = 700nm
f = c/λ = 3 x 108/700 x 10-9
= 4.28 x 1014 Hz
E = hf = 6.626 x 10-34 x 4.28 x 1014
= 2.83 x 10-19 J
Click here to view video
Electromagnetic Wave propagation.
Wave
Electromagnetic radiation
Electromagnetic radiation •Moving charges/particles through space •Oscillating wave like property of electric and magnetic field•Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.
wave
Wave – wavelength and frequency - travel at speed of light
Electromagnetic wave propagation
Click here to view video
Electromagnetic Wave propagation.
Wave
Electromagnetic radiation
Simulation on Electromagnetic Propagatin
Click here to view simulation Click here to view simulation Click here to view simulation
Electromagnetic radiation •Moving charges/particles through space •Oscillating wave like property of electric and magnetic field•Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.
wave
Wave – wavelength and frequency - travel at speed of light
Electromagnetic wave propagation
Click here to view video
Electromagnetic Wave
Violet
λ = 410nm
Red
f = c/λ = 3 x 108/410 x 10-9
= 7.31 x 1014 Hz
λ = 700nm
f = c/λ = 3 x 108/700 x 10-9
= 4.28 x 1014 Hz
Wavelength – Distance bet two point with same phase, bet crest/troughs – unit nmFrequency – Number of cycle/repeat per unit time (cycles in 1 second) – unit Hz
Electromagnetic Wave
Violet
λ = 410nm
Red
f = c/λ = 3 x 108/410 x 10-9
= 7.31 x 1014 Hz
λ = 700nm
f = c/λ = 3 x 108/700 x 10-9
= 4.28 x 1014 Hz
Which light wave have higher frequency, if both have same speed reaching Y same time?
Violet light
Y
Red light
X
Wavelength – Distance bet two point with same phase, bet crest/troughs – unit nmFrequency – Number of cycle/repeat per unit time (cycles in 1 second) – unit Hz
Electromagnetic Wave
Violet
λ = 410nm
Red
f = c/λ = 3 x 108/410 x 10-9
= 7.31 x 1014 Hz
λ = 700nm
f = c/λ = 3 x 108/700 x 10-9
= 4.28 x 1014 Hz
Which light wave have higher frequency, if both have same speed reaching Y same time?
Violet light
Y
Red light
X
Wavelength – Distance bet two point with same phase, bet crest/troughs – unit nmFrequency – Number of cycle/repeat per unit time (cycles in 1 second) – unit Hz
Click here on excellent video red /violet wave
Light travel same speedRed flippers – long λ - less frequentViolet shoes – short λ - more frequent
Click here to view video energy photon
Quantum Weirdness – Is Light/electron a Wave or Particle?
Pass BIG particles through a 2 slit
Pass waves through a 2 slit
Particle gun
Slit
2 bands Interference patterns of many bands
Click here to view simulation
Quantum particles – small particles, like electrons – Is light/electron a Wave or Particle?
Quantum Weirdness – Is Light/electron a Wave or Particle?
Pass BIG particles through a 2 slit
Pass waves through a 2 slit
Particle gun
Slit
2 bands Interference patterns of many bands
Pass electron through a 2 slit
Interference patterns of many bands
Does electron behave as
Particles
Waves
Click here to view simulation
Particles /photon •single slit – single band•double slit – double band
Wave •Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Quantum particles – small particles, like electrons – Is light/electron a Wave or Particle?
Quantum Weirdness – Is Light/electron a Wave or Particle?
Pass BIG particles through a 2 slit
Pass waves through a 2 slit
Particle gun
Slit
2 bands Interference patterns of many bands
Pass electron through a 2 slit
Interference patterns of many bands
Does electron behave as
Particles
Waves
Click here to view simulation
Particles /photon •single slit – single band•double slit – double band
Wave •Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Principle of wave–particle duality.
Quantum particles – small particles, like electrons – Is light/electron a Wave or Particle?
Single electron behave like particles but travel like a wave
Quantum Weirdness – Is Light/electron a Wave or Particle?
Pass BIG particles through a 2 slit
Pass waves through a 2 slit
Particle gun
Slit
2 bands Interference patterns of many bands
Pass electron through a 2 slit
Conclusion
Interference patterns of many bands
Does electron behave as
Particles
Waves
Waves
Click here to view simulation
Pass electron through a 2 slit
Interference patterns of many bands
Particles
Waves
Quantum Weirdness – Is Light/electron a Wave or Particle?
Does electron behave as
Click here to view simulation
Particles/photon •single slit – single band•double slit – double band
Waves•Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Pass electron through a 2 slit
Interference patterns of many bands
Particles
Waves
Quantum Weirdness – Is Light/electron a Wave or Particle?
Does electron behave as
Click here to view simulation
Particles/photon •single slit – single band•double slit – double band
Waves•Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Pass electron through a 2 slit
Interference patterns of many bands
Particles
Waves
Pass electron through a 2 slit
Measuring /observing it- which slit it passes through
Waves
Particles
Quantum Weirdness – Is Light/electron a Wave or Particle?
Does electron behave as
Does electron behave as
Click here to view simulation
Particles/photon •single slit – single band•double slit – double band
Waves•Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Pass electron through a 2 slit
Interference patterns of many bands
Particles
Waves
Pass electron through a 2 slit
Measuring /observing it- which slit it passes through
Waves
Particles Particles/photon •single slit – single band•double slit – double band
Waves•Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Quantum Weirdness – Is Light/electron a Wave or Particle?
Does electron behave as
Does electron behave as
Click here to view simulation
Particles/photon •single slit – single band•double slit – double band
Waves•Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Principle of wave–particle duality.Wave of possibility.
Single electron behave like particle but travel like a wave
Pass electron through a 2 slit
Interference patterns of many bands
Particles
Waves
Pass electron through a 2 slit
Measuring /observing it- which slit it passes through
Waves
Particles Particles/photon •single slit – single band•double slit – double band
Waves•Crest/trough appearing•Double slit – interference behind screen – bright/dark bands
Quantum Weirdness – Is Light/electron a Wave or Particle?
Does electron behave as
Does electron behave as
Conclusion
Try to measure it.
Is light a Wave or Particle?
Current measured
Photoelectric effect
Electrons are release (photoelectrons)
Light hits metal
Click here to view video
Is light a Wave or Particle?
Is Light a Wave or Particle?
VS
Current measured
Click here to view video
Wave Theory Particle Theory
Photoelectric effect
Electrons are release (photoelectrons)
Light hits metal
Light – Shows photoelectric effect Shine light to metal Current measured
Click here to view video
Is Light a Wave or Particle?
Is light a Wave or Particle?
Is Light a Wave or Particle?
VS
Current measured
Click here to view video
Wave Theory Particle Theory
Particle Theory•Light energy comes in tiny packets -photons•Amt energy directly proportional to frequency, E = hf•Red light – low freq – low energy •Blue light – high freq – high energy
Wave Theory•Light energy arrives continuously, regardless of freq•Energy proportional to amplitude•Intensity light – depends on amplitude•Low intensity – low amplitude•High intensity – high amplitude
Photoelectric effect
Electrons are release (photoelectrons)
Light hits metal
Light – Shows photoelectric effect Shine light to metal Current measured
Click here to view video
Is Light a Wave or Particle?
Is light a Wave or Particle?Is Light a Particle or Wave?
VSClick here to view video
Wave Theory Particle Theory
Light – Shows photoelectric effect Shine light to metal Current measured
Is Light a Wave or Particle?
Is light a Wave or Particle?Is Light a Particle or Wave?
VSClick here to view video
Wave Theory Particle Theory
Wave Theory•Light energy arrives continuously, regardless of freq•Energy proportional to amplitude•Intensity light – depends on amplitude•Low intensity – low amplitude•High intensity – high amplitude
Light – Shows photoelectric effect Shine light to metal Current measured
Is Light a Wave or Particle?
Wave TheoryParticle Theory
Colour/Frequency light Intensity light Colour/Frequency light Colour/Frequency light
Particle Theory•Light energy comes in tiny packets -photons•Amt energy directly proportional to frequency, E = hf•Red light – low freq – low energy •Blue light – high freq – high energy
Is light a Wave or Particle?Is Light a Particle or Wave?
VSClick here to view video
Wave Theory Particle Theory
Wave Theory•Light energy arrives continuously, regardless of freq•Energy proportional to amplitude•Intensity light – depends on amplitude•Low intensity – low amplitude•High intensity – high amplitude
Light – Shows photoelectric effect Shine light to metal Current measured
Is Light a Wave or Particle?
Wave Theory
Low intensity – Low amplitudeHigh intensity –High amplitude
Particle Theory
Red light Low frequency – Low energy
Blue light High frequency – High energy
Colour/Frequency light Intensity light Colour/Frequency light Colour/Frequency light
Light energy arrives continuously, regardless of frequency
Particle Theory•Light energy comes in tiny packets -photons•Amt energy directly proportional to frequency, E = hf•Red light – low freq – low energy •Blue light – high freq – high energy
Is light a Wave or Particle?
VSClick here to view video
Is Light a Wave or Particle?
Wave Theory Particle Theory
Colour/Frequency light Intensity light Colour/Frequency light Colour/Frequency light
Is light a Wave or Particle?
VSClick here to view video
Is Light a Wave or Particle?
Wave Theory Particle Theory
Colour/Frequency light Intensity light Colour/Frequency light Colour/Frequency light
If light is Wave•Colour/Intensity of light NOT important !•Regardless of colour/freq/intensity
Shine light LONG enough
If light is Particle•Colour/Frequency of light is important !
Shine RED light Shine BLUE light
Red light Low freq – Low energy
Blue light High freq – High energy
Are electrons released?
Is light a Wave or Particle?
VSClick here to view video
Is Light a Wave or Particle?
Wave Theory
No electrons released
Particle Theory
Colour/Frequency light Intensity light Colour/Frequency light Colour/Frequency light
If light is Wave•Colour/Intensity of light NOT important !•Regardless of colour/freq/intensity
Shine light LONG enough
If light is Particle•Colour/Frequency of light is important !
Shine RED light Shine BLUE light
Electrons are released No electrons released Result!
Red light Low freq – Low energy
Blue light High freq – High energy
Are electrons released?
Is light a Wave or Particle?
Click here to view video
Stream of light
Is Light a Wave or Particle?
Stream of photonFixed amt of energy – E = hf Is Light a Wave or Particle?
Is light a Wave or Particle?
Click here to view video
Stream of light
Is Light a Wave or Particle?
Stream of photonFixed amt of energy – E = hf Is Light a Wave or Particle?
Is Light a Wave or Particle?
Is light a Wave or Particle?
Click here to view video
Stream of light
Is Light a Wave or Particle?
Stream of photonFixed amt of energy – E = hf Is Light a Wave or Particle?
Is Light a Wave or Particle?
Click here to view video Click here wave and particle Click here wave and particleClick here wave and particle
Video Is Light a Wave or Particle?
Acknowledgements
Thanks to source of pictures and video used in this presentation
Thanks to Creative Commons for excellent contribution on licenseshttp://creativecommons.org/licenses/
Prepared by Lawrence Kok
Check out more video tutorials from my site and hope you enjoy this tutorialhttp://lawrencekok.blogspot.com