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Mrs Smallwoods class have enjoyed looking at a sheep’s lung today. They were able to identify the trachea and a group of children got to dissect the trachea, heart and the Bronchus Tubes.
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Physics Photo Of The Day:
Niels Bohr lecturing on Quantum Mechanics in Iowa, 1950. Bohr is seen explaining the Double slit experiment.
Young's double slit experiment is a demonstration that light can behave like a wave and produce interference patterns. The experiment involves shining a coherent light source, such as a laser, on a screen with two slits cut into it. The light waves passing through the two slits interfere with each other, creating a pattern of bright and dark fringes on another screen behind the slits. The position and width of the fringes depend on the wavelength of the light and the distance between the slits and the screen. The experiment shows that light can act as a wave when it propagates through space, but it can also act as a particle when it is detected on the screen. This is an example of the wave-particle duality of light and matter.
The main features of the experiment are:
॰ Coherent light source: A light source that emits waves of the same frequency and phase. This ensures that the waves from the two slits are in phase when they reach the screen.
॰ Two slits: Two narrow openings in a screen that act as secondary sources of light waves. The distance between the slits is denoted by **d** and is usually much larger than the wavelength of the light.
॰ Interference pattern: The pattern of bright and dark fringes on the screen behind the slits. The bright fringes occur when the waves from the two slits are in phase and constructively interfere, while the dark fringes occur when they are out of phase and destructively interfere.
The position of the fringes is given by
y = nλD/d,
where 'y' is the distance from the central fringe, 'n' is an integer, 'λ' is the wavelength of the light, 'D' is the distance between the slits and the screen, and 'd' is the distance between the slits.
The width of each fringe is given by
β = λD/d, which is also called the fringe spacing.
॰ Wave-particle duality: The phenomenon that light and matter can exhibit both wave-like and particle-like properties depending on how they are observed.
In this experiment, light behaves like a wave when it passes through the slits and interferes with itself, but it behaves like a particle when it hits the screen and produces discrete spots of intensity.
[Image Credit : Des Moines Register.]