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Lecture

# PHYS1041 Notes Week 10

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Mount Allison University

Physics

PHYS 1041

Dr.David Fleming

Winter

Description

Physics 1041
Notes
April 7th
Light bright fringes:mλ = d sinθ
1
Dark spots between the bright spots: (m + )λ = d sinθ
2
Single Opening:
• even for a single opening, light waves coming through that opening can undergo
interference
• this still creates a pattern of bright and dark spots, but less pronounced
• the brightest spot is the central spot with less intense spots on either side,
becoming dimmer with order number
Rayleigh criterion:
• the 2 peaks are just barely resolvable as distinct objects if the central maximum of
one of the objects corresponds with the minimum of the other
• for a rectangular opening, Rayleigh criterion occurs for: min= λ where θ minis
a
the minimum angle of separation (in radians), λ is the wavelength of the light, and
a is the width of the slit opening
• a complete circle has 360 degrees, or 2π radians
• 1 radian = 360º/2π
λ
• for a circular opening, Rayleigh criterion occurs for min= 1.22 D where θ minis
the minimum angle of separation (in radians), λ is the wavelength of the light, and
D is the diameter of the circular opening
s
• also, θ = L when s is the distance between the two objects, and L is the distance
between the objects and the opening
April 9th
Modern Physics:
• in 1905, Einstein's early work involved studying light
• it was discovered that light has wave-particle duality: it can behave as both
• we think of electrons as a point particle with a negative charge, however they are
also capable of behaving like a wave
• the wavelength of the wave of matter is equal to λ = h , where h is equal to
p
Planck's constant, 6.63 x 10 Js and p is equal to momentum (mass times
velocity)
• therefore all matter can behave as a wave; however we do not see them • this is because visible objects have such a large mass, that t

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