Embedded Files
Superposition
Superposition
Superposition of Waves
Superposition of Waves
Y12 Recap - SciPad p. 34-36
Interference, Reflection, and Diffraction
Interference, Reflection, and Diffraction
Double Slit Interference
Double Slit Interference
Diffraction Grating
Diffraction Grating
Multiple Point Source Interference
Multiple Point Source Interference
Q. Outline why the dark fringes in multiple-point interference patterns are wider/broader than in double slit interference.
Q. Outline why the dark fringes in multiple-point interference patterns are wider/broader than in double slit interference.
Between antinodal lines, there are more waves that are partially out of phase and so there is more destructive interference occurring.
Q. Explain why the light fringes are brighter in multiple-point interference patterns.
Q. Explain why the light fringes are brighter in multiple-point interference patterns.
The fringes will be brighter because more light waves are meeting at those points. For example, with four slits compared to two, twice as much light is passing through and reaching the screen.
Diffraction Grating and White Light
Diffraction Grating and White Light
Red light has longest wavelength so is diffracted through the largest angle.
Violet light has shortest wavelength so is diffracted through the smallest angle.
Diffraction Gratings
Diffraction Gratings
How do diffraction grating work and what can we use them for?
Diffraction grating
Diffraction grating
Diffraction Grating = Multiple Point Source
Full lesson at Khan Academic - Khan Academy
X-ray Crystallography
X-ray Crystallography
X-ray crystallography is arguably one of the greatest innovations of the twentieth century, but not that many people know what it is or how it came about.
X-rays and CT Scan
X-rays and CT Scan
TED-Ed - 4 min
Celebrating Crystallography
Celebrating Crystallography
The Royal Institution - 3 min animation
Seeing Things in a Different Light: How X-ray crystallography revealed the structure of everything
Seeing Things in a Different Light: How X-ray crystallography revealed the structure of everything
One-hour lecture by Prof Stephen Curry at the Royal Institution in 2013.
The inspiring lecture started by introducing basic high school physics of
single-slit diffraction,
Young's double slits interference, and
Diffraction Grating,
and introductory university physics of
Bragg's Law
with the aids of basic geometry and advanced math skill (Fourier Transform), then applied these understandings to physical chemistry studying structures of crystals and molecules and molecular biology studying structures of biological molecules such as proteins and DNA.
It is amazing to see how this basic physics concept (superposition principle) works across the boundaries of different sciences and enjoy Prof Curry's humour that "we know now, thanks to Quantum Mechanics, that Ladies can be fashionable and intelligent at the same time, as can men."
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