# Quantum Physics Explained To Grandma - Draft

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Information about Quantum Physics Explained To Grandma - Draft
Education

Published on March 18, 2009

Author: ArjenDijksman

Source: slideshare.net

## Description

First slides for a grandmother's explanation of Quantum Physics.

You do not really understand something unless you can explain it to your grandmother. ~ quote attributed to Albert Einstein Quantum Physics as I would explain it to my grandmother

...it isn’t as horrible as it looks. ~ Richard Feynman All elementary particles are arrows (1st principle) Arrows may: - rotate about their center (2nd principle) - travel through space (3rd principle) - interact with each other (4th principle)

All we do is draw little arrows on a piece of paper – that's all. arrow 1 ~ Richard Feynman All elementary particles are arrows (1st principle) arrow 2 for grandma for insiders ψ1 arrow addition arrow 1 + arrow 2 |ψ+> = |ψ1> + |ψ2> = ( )ψ2 kets state vectors vector space ψ1 arrow subtraction arrow 1 - arrow 2 |ψ−> = |ψ1> − |ψ2> = ( )−ψ2 Hilbert space arrow multiplication: half times arrow 1 |ψ0.5> = 0.5|ψ1> enlarge or shorten complex numbers and half times arrow 1 times angle 50° |ψ50°> = 0.5 exp (2πi.50/360) |ψ1> rotate

Elementary particles are extremely boring ~ Steven Weinberg Arrows may rotate about their center (2nd principle) possibilities for rotation for grandma for insiders polarization the velocity at the tips of the Schrödinger arrow is perpendicular to the i d|ψ>/dt = ω |ψ> equation arrow itself 2D Axis keeps same direction 3D spin Axis also spins about another axis

All we do is draw little arrows on a piece of paper – that's all. ~ Richard Feynman Arrows may travel through space (3rd principle) for grandma for insiders

All we do is draw little arrows on a piece of paper – that's all. ~ Richard Feynman Arrows may interact with each other (4th principle)

Dedicated to my grandmothers Elisabeth Margaretha Dijksman van den Broeck Maria Magdalena de Boer van der Linden 15 August 1910 - 3 January 2006 16 March 1912 - 5 November 2000 You do not really understand something unless you can explain it to your grandmother. ~ quote attributed to Albert Einstein

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