Module 2 Flashcards
What theories of light did Isaac Newton propose?
Particle Theory
Corpuscular Theory
Who proposed the Particle Theory of light?
Isaac Newton
Who proposed the Corpuscular Theory of light?
Isaac Newton
What theory of light did Robert Hooke and Huygens propose?
Wave Theory
Who proposed the Wave Theory of light?
Robert Hooke & Huygens in the 1600’s
Who substantiated the wave theory of light through the Double Slit experiment?
Thomas Young in 1800
What did Thomas Young do in 1800?
Substantiated the Wave Theory of light through the Double Slit experiment
Who proposed that light is electromagnetic radiation and waves are transverse?
James Maxwell
What did James Maxwell propose?
That light is electromagnetic radiation and waves are transverse
Who didn’t agree with the Wave Theory, but instead believed light was discrete packets of energy called quanta (later renamed photons)?
Max Plank
Who was Max Plank?
He didn’t agree with the Wave Theory of light, but instead believed that light was discrete packets of energy called quanta (later renamed photons)
What Theory of light did Max Plank propose?
Quantum Theory of Light in 1900 - light is radiated and absorbed continuously in small units (photons)
Who proposed the Quantum theory of light?
Max Plank
Who proposed that the behavior of light had characteristics of both the wave and particle theory?
Albert Einstein in 1905
What theory of light did Albert Einstein believe?
That the behavior of light had characteristics of both the wave and particle theory
Explain the Double Slit experiment
One surface, one slit
Second surface, two slits
Strip pattern appears (light and dark)
Interference pattern, two types (constructive interference and destructive interference)
What is constructive interference?
When the waves meet the amplitudes are added together (increased)
What is destructive interference?
When the waves meet the amplitudes cancel each other out (crest meets the trough)
What are the 3 parts of a wave?
Crest
Trough
Wavelength
What is the top of a wave called?
Crest
What is the bottom of a wave called?
Trough
What is the distance from a point on one wave to the corresponding point on the next wave?
Wavelength
What is the number of waves that pass in 1 second called?
Frequency
What is the distance that the wave will travel in 1 second called?
Speed
What is the distance from the center line to the peak or to the valley of a wave called?
Amplitude
What is the electromagnetic spectrum (nm) from shortest wavelength (highest freq) to longest wavelength (shortest freq)?
Gamma Rays (10 to the -14) UV (10 to the -8) Visible light (10 to the -6) IR radiation (10 to the -4) A-C (10 to the 8)
List the order of colors in the visible spectrum
Red (700 nm) Orange Yellow Green Blue Indigo Violet (400 nm)
What is the speed of light?
3 x 10 to the 8 m/sec or 186,000 miles/sec
Wavelength and frequency have what type of relationship?
Inversely proportionate
What is a photon?
smallest amount of light possible; a particle of light; that travels in a straight line unless it changes speed or passes a barrier
What is a ray?
the path of a single photon of light from a single point on a light source
What are pencils?
a group of rays divergent from a single point on a light source
What is a beam of light?
the group of pencils originating from all of the points on a light source
What is the formula for velocity of light?
v (speed of light) = freq x wavelength
What is the index of refraction?
the ratio of light in a vacuum to the speed of light in another medium
What is the normal?
a line perpendicular to the reflecting surface at the point of reflection
What is the angle of reflection?
the angle at which the light ray is reflected
What does the angle of incidence equal?
the angle of reflection
What does Snell’s Law deal with?
Refraction of a single light ray
What is refraction?
The bending of light by a lens or optical system
What is the refractive index of air?
1
What is the formula for angle of deviation?
d = i - i’
What is the formula for Snell’s Law?
n sin i = n' sin i' where n = refractive index of material 1 n' = refractive index of material 2 i = angle of incidence i' = angle of refraction
What is the refracted ray?
the angle between the normal and the path of the refracted ray
What are the 3 possible outcomes of Snell’s Law?
Light bends toward the normal
Light bends away from the normal
Light travels unrefracted when incident at 90 degrees to the interface