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Physics 2: Waves (Waves: (Key Words: (Frequency:
Number of waves passing…
Physics 2: Waves
Waves:
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Method to measure speed of sound (air):
- 2 people stand 100m apart
- 1 hits 2 blocks of wood together while 1 person times it
- Stop the time when you hear the sound
- Calculate the speed (Speed = Distance/ Time)
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Lenses:
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Kinds of images:
- Convex - Real or Virtual
- Concave - Virtual
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Black body radiation:
If body at constant temp, What is the absorption/ emission rate?
Absorbing at the same rate as emitting
(Temp increases - When the body absorbs faster than emits)
"Perfect" Black body:
- Absorbs all radiation incident on it
- Best possible emitter
Earth's Temperature depends on?
Amount of radiation: absorbed, transmitted or reflected
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Refraction:
What happens when a wave enters denser medium:
- Slows down & bends away from normal
(Opposite w/ a less dense)
Refraction:
- Waves change speed as they travel through diff medians
- Causes waves to change direction
Three scenarios that happen at boundaries:
- Absorb - Take in energy
- Transmit - Passes on energy
- Reflect - Bounce off an object
Visible light:
Types of Reflection:
- Specular - Smooth surface in 1 direction
- Diffuse - From a rough surface causing scattering
What happens when a wave hits opaque?
- Some Waves are absorbed
- Colour determined by which waves are more strongly reflected
- If all waves are reflected equally then its white (opposite = Black)
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Sound waves:
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Why do Humans have limited hearing range:
- Limited to 20kHz
- As SW causes ear drum to vibrate
- Conversion from SW - Vibrations works over a limited Freq