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Final

PHY100H1 Study Guide - Final Guide: Double-Slit Experiment, Quantum Superposition, Wave Function Collapse


Department
Physics
Course Code
PHY100H1
Professor
Vatche Deyirmenjian
Study Guide
Final

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Part 4, Quantum Mechanics
32) What is observed when Thomas Young's double slit experiment is performed with
extremely dim light? How does quantum mechanics explain these observations?
http://physics.about.com/od/lightoptics/a/doubleslit.htm
When Thomas Young's double slit experiment is performed with extremely dim light and
record the results on photographic film placed on the receiving screen and exposed very
briefly to the light from the slits, a surprising result emerges. Instead of the wave-
interference pattern, tiny individual flashes appear randomly all over the screen. If we
expose the film for a longer time, an interference pattern begins to emerge, formed by the
impacts of a large number of individual photons. The pattern becomes clearer the longer we
wait.
33) A beam of light consists of a stream of photons, in the quantum mechanical
view. Describe several ways that this stream of particles differs from a stream of classical
particles, like a stream of sand grains falling from a funnel.
A stream of photons differs from a stream of classical particles are as follows:
Photons have no rest-mass while classical particles like sand grains have rest-mass; a stream
of photons moves at lightspeed while a stream of classical particles like sand move at much
much slower speed than lightspeed; photons are radiation while classical particles are
matter; photons are small particles while classical particles like sand grains are large
particles.
34) Why don't we observe the quantum wave-like properties of the ball during a baseball
game?
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