Light, Sound and Waves

Big Idea: Waves carry information without causing a permanent change on the intervening medium. More info...

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Photons and selective absorption

Photons are all-or-nothing entities: you cannot emit or absorb half a photon. (Remember that to detect a photon you have to...

Physics Narrative 14-16

Simple harmonic oscillators show resonance if they are forced to vibrate at their natural frequency. This is a phenomenon of...

Lesson 16-19

The two identical bottles vibrate at the same natural frequency. So when one vibrates and produces a note, this makes the...

Enrichment Activity 5-11 11-14

Rubbing the glass makes it vibrate at its natural frequency. Because the other glass is identical it has the same natural...

Enrichment Activity 5-11 11-14