Physics - OCR Gateway - Foundation Tier - P4
- Created by: lala2127
- Created on: 14-06-18 11:50
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- Physics - P4
- Wave Basics
- Transfer energy
- Medium = what is travelling through
- Particles stay in the same place - energy moves
- Transverse waves
- Sideways vibrations
- e.g ripples on the surface of water
- Longitudinal waves
- Vibrations in direction of travel
- e.g. sound waves
- Wave Speed
- Wave speed = frequency x wavelength
- Oscilloscope
- Reflection
- Angle of incidence = angle of reflection
- Practical: use a ray box and a mirror
- Refraction
- Waves change direction at a boundary
- The way it bends depends on the material it goes through
- Electromagnetic Waves
- Radio waves
- communication
- Microwaves
- Satellites and cooking
- Infra-red radiation
- Cook and heat things
- Visible light
- Send data through fibre optic cables
- Ultraviolet ratiation
- Suntan
- X-Rays and gamma rays
- Medicine
- Radio waves
- Radioactive Decay
- Alpha
- Mass: 4, Charge: +2
- Beta
- Mass: n/a, Charge: -1
- Gamma
- Mass: n/a, Charge: n/a
- Alpha
- Half Life
- Average time taken for activity (or count rate) to halve
- For half of the unstable nuclei to decay
- Short half life - activity falls quickly
- Long half life - activity falls quickly
- Average time taken for activity (or count rate) to halve
- Wave Basics
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