an incident ray from air strikes dolomite (n = 2.0) at an angle of 30 o from normal
DESCRIPTION
An incident ray from air strikes dolomite (n = 2.0) at an angle of 30 o from normal. Calculate: refl & refr. Chapter 19. Diffraction & Interference. List & describe 3 properties of waves. Diffraction. The bending of light rays when passing a barrier. Diffraction. - PowerPoint PPT PresentationTRANSCRIPT
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An incident ray from air strikes dolomite (n = 2.0) at an angle of 30o from normal.
Calculate: refl & refr
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Chapter 19Diffraction & Interference
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List & describe 3 properties of
waves
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Diffraction•The bending of light rays when passing a barrier
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Diffraction•Named by Francesco
Grimaldi by seeing blurred edges of
shadows
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Isaac Newton•Predicted that light moved in the form of particles to explain
diffraction
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Christiaan Huygens•Predicted that light moved in the form of
waves to explain diffraction
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Thomas Young•Proved that light moved in the form of waves by
passing light thru a double slit. P 445
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Thomas Young•The interference pattern caused by
diffraction produced dark & light lines
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Monochromatic Light
•Light having only one wavelength
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Coherent Waves•Waves all in the
same phase
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Diffraction InterferenceLightwaves
d
n
n
L
x
x L d=
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Diffraction Interferencex L d=
xd L =
Doubleslit
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Calculate wavelength reinforced when waves passing through 2 slits 25 m apart cast bright lines 4.0 cm apart on a
screen 2.0 m away
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Calculate wavelength reinforced when waves
passing through 2 slits 25 m apart cast bright lines
that make a 37o angle from the principle axis
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Diffraction Interferenced = distance between slits w = slit width
xd xw L L
= =
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Diffraction InterferenceLightwaves
d
n
n
L
x
d sin
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Wave Properties• Propagation• Reflection• Refraction• Diffraction • Interference
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Propagation•Within a uniformed
medium, the generation of waves that move in straight
lines called rays
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Reflection•The bouncing of
waves off surfaces or medium boundaries
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Refraction•The bending of
waves when passing from one medium to
another
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Diffraction•The bending of
waves when passing around barriers
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Interference•The superimposing two or more waves passing through the
same medium simultaneously
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Photoelectric Effect•The emission of
electrons (e-)from a substance when
irradiated
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1st Law of Ph Eff•The rate of e- emission
is proportional to the intensity of the incident
light
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2nd Law of Ph Eff•The KE of e- emission
is independent of the intensity of the incident
light
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Photoelectric Effect•This led to the
discovery that e- in atoms exist in
distinct energy levels
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Spectroscopy•The study of a substance under
continuous excitation energy
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Energy of a Wave
Ewave = hf
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Energy of Matter
Ematter = mc2
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Duality of Nature
Proposed by Louis de Broglie
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Duality of NatureAll energy transfer exhibits properties of both waves &
particles
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Duality Formula
= hmv
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Calculate the wavelength 2.21
kg of a ball thrown at 20.0 m/s
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Calculate the mass of blue light at
442 nm
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Calculate the wavelength of a 442 Mg truck moving at 36
km/hr
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Calculate the wavelength of a 4.42 x 106 Mg
train moving at 72 km/hr
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The of near IR red light is 663 nm.Calculate: E & m of
the light
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The of near UV light is 221 nm.
Calculate: E & m of the light
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Calculate wavelength reinforced when waves
passing through 2 slits 25 m apart cast bright lines
that make a 53o angle from the principle axis
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Calculate wavelength reinforced when waves
passing through a slit 75 m slit cast bright lines
that make a 53o angle from the principle axis
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Calculate wavelength reinforced when waves passing through 2 slits 75 m apart cast bright lines 5.0 cm apart on a
screen 2.5 m away
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Calculate wavelength reinforced when waves
passing through a 15 m slit cast bright lines 3.0 cm apart on a screen 2.5
m away
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A wavelength 180 nm is reinforced when waves
passing through a 15 m slit cast bright lines 3.0 cm apart. What is the
screen distance?
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A wavelength 18 nm is reinforced when waves passing through a 1.5
m slit cast bright lines 3.0 cm apart. What is the
screen distance?
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Review
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Calculate wavelength reinforced when waves
passing through a 25 m slit cast bright lines 5.0
cm apart on a screen2.5 m away
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Calculate the mass & energy of UV light at
221 nm.
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Calculate Kinetic energy &
wavelength of a 442 g ball going
30.0 m/s
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Calculate wavelength reinforced when waves
passing through a slit 4.5 m slit cast bright lines
that make a 37o angle from the principle axis