Category Archives: Unit 4

Veritasium – The world in UV

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Professor Dave Explains: Bohr Model of the Hydrogen Atom

Why don’t protons and electrons just slam into each other and explode? Why do different elements emit light of different colors? Niels Bohr knew why. And now you will too!

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Professor Dave Explains: Wave-Particle Duality and the Photoelectric Effect

Look, up in the sky, it’s a particle! It’s a wave! Actually it’s both. It’s light! How do we know about this stuff? Well, because of Einstein for one. He did more than E = mc^2, you know. But don’t … Continue reading

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Exam formula sheet

Here is a copy of the exam¬†formula sheet with rearrangements of equations. It’s a very long list; it would be useful to¬†make sure that you have the rearrangements (particularly kinematics and gravity) on your own summary sheet.

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Diffraction & interference podcast

Diffraction, Diffraction through gaps, Interference patterns – two sources, Calculating interference patterns, Calculating interference patterns – directly between sources Calculating interference patterns – in front of one source. Download the notes. Download the videos. Links: pHET Wave interference Interference of … Continue reading

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Making music podcast

Standing waves in strings, Speed of waves in strings, Standing waves in strings – other harmonics, Beats, Open ended pipes, Open ended pipe harmonics, Closed pipes, Closed pipes harmonics, Harmonics & timbre, Spectral analysis Download the notes. Download the video.

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Sound waves podcast

Sound waves, Wave equations, Speed of sound, The Ear, Speed of sound, Sounds are waves, Intensity, Pitch, Timbre. Download the notes. Download the video. Links: http://www.walter-fendt.de/ph14e/stlwaves.htm http://en.wikipedia.org/wiki/Ear

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The Fabric of The Cosmos: Quantum Leap

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Physics Girl – Can you push a spacecraft with light?

What if you could power a ship using sunlight instead of wind? Well in space, you can! Solar sails or light sails are pushed with light from the sun. Photons provide a kick when they reflect off the sail pushing … Continue reading

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Physics Girl – Exploding soda cans with electromagnets in slow motion

Watch a soda can rip itself apart in a fiery explosion at 11,000fps with a Phantom high speed camera. Running a current through a coil, produces an electromagnet. Turn up the voltage in this experiment, and make that current strong … Continue reading

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