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Inverse square law If you double the distance, the effect diminishes by 4 (2 squared)

Conceptual Physics Reference Sheet: 5/9/14. Inverse square law If you double the distance, the effect diminishes by 4 (2 squared) If you triple the distance, the effect diminishes by 9 (3 squared) If you quadruple the distance, the effect diminishes by ____ (___ squared)

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Inverse square law If you double the distance, the effect diminishes by 4 (2 squared)

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  1. Conceptual Physics Reference Sheet: 5/9/14 Inverse square law If you double the distance, the effect diminishes by 4 (2 squared) If you triple the distance, the effect diminishes by 9 (3 squared) If you quadruple the distance, the effect diminishes by ____ (___ squared) If you quintuple the distance, the effect diminishes by ____ (___ squared) What types of physical phenomena can be described with the inverse square law? _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ https://www.youtube.com/watch?v=JW3tT0L2gpc

  2. Key characteristics of waves Amplitude: The height of the wave from node to antinode (transverse waves), or the distance between compression and rarefaction in a in a compressive wave. Measured in units describing the wave Wavelength: The distance traversed by a full cycle of the wave Node: The “zero point” of the wave Antinode: The extreme point of the wave (max or min amplitude) Period: The time between successive waves Frequency: The rate of occurrence of the wave (in Hertz or cycles / second) Node Antinode Amplitude Wavelength

  3. Speed of Waves The relationship between wave speed, wavelength, and frequency is simple • For a given temperature, pressure, material, etc. v = fl, where v is the speed, f is the frequency, and lambda is the wavelength. Example of what happens when you change the speed!

  4. Conceptual Physics Reference Sheet: 5/9/14 Doppler Effect: When the source of sound (or the hearer of the sound) is moving, the waves in front of the source “bunch up” and the waves behind the source spread out. The frequency goes up in front and gets lower behind the source as it goes by. More train Fire Siren Train Doppler Sonic Booms

  5. Conceptual Physics Reference Sheet: 2/29/12 Reflection Incident wave Law of Reflection: The angle of incidence equals the angle of reflection, as measured from the normal. “Normal” Normal Reflected wave Incident ray Reflected ray qi qr

  6. Conceptual Physics Reference Sheet FAST SLOW Refraction “Normal” What makes lenses work?

  7. Refraction https://www.youtube.com/watch?v=yfawFJCRDSE https://www.youtube.com/watch?v=zTx7UoPXvr4 n = index of refraction qi qr qi Light slows down in here!

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