Physics topic 4
- Created by: molly
- Created on: 01-04-18 21:31
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- Physics-T4
- Waves
- Longitudinal waves: A wave where the vibrations are parallel to the direction in wich the wave is travelling. E.g sound waves and seismic P waves
- Transverse waves: A wave where the vibrations are at a right angle in wich the wave is travelling. E.g water, electromagentic
- describing waves
- Frequency: number of waves passing a point each second (Hz)
- Speed: the speed (m/s)
- period: length of time it takes one wave to pass a given point
- wavelength: distance from one point on a wave to the same point on the next wave (M)
- Amplitude: maximum point on a wave from its resting position (M)
- Velocity: speed in the direction its travelling
- Wave equations (on flash cards)
- Refraction
- refraction can result in a change in direction when a wave enters a different medium
- Waves crossing boudries
- when wave reach an interface they can be:
- reflected - bounces off
- Refracted - the wave passes into a new material but changes direction
- Transmitted - wave passes through the material
- Absorbed - the wave disappears as the energy it is carrying is transferred into the material
- when wave reach an interface they can be:
- Ears and Hearing
- see notes
- Ultrasound
- higher than 20000 Hz
- Infrasound
- Lower than 20 Hz
- Longitudinal P waves
- Transverse S waves
- Waves
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