Waves
- Created by: dontexistplz
- Created on: 09-05-19 12:35
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- Waves
- Electro-magnetic Spectrum
- Radio-waves: television signals
- Microwaves: cooking
- Infrared: heat sensitive cameras
- Visible: seeing
- Ultraviolet: UV lamps
- X-ray: images of bones
- Gamma Rays: kills cancer cells
- Transverse & Longitudinal Waves
- Transverse: oscillations are perpendicular to the direction of energy transfer
- Longitudinal: oscillations are parallel to the direction of energy transfer
- Definitions
- Wavelength: the distance between two crests - high points
- Frequency: the num. of waves that pass a fixed place in a given amount of time
- Time Period: the time taken for one cycle of vibration to pass fixed point
- Amplitude: the height of the wave from the resting position.
- Refraction
- When a wave changes speed & sometimes direction upon entering a dense medium
- e.g. a light ray changes direction when refracted by a lens.
- Changes in atoms produce electromagnetic waves of various frequencies
- changes in the nuclei of atoms produce radiation
- waves all travel at the same speed - 300 million m/s in space
- Electro-magnetic Spectrum
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