What happens when a wave is absorbed at a boundary?
The energy is transferred to the materials energy stores as thermal energy.
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What is the law of reflection?
The angle of incidence is equal to the angle of reflection.
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Why does white light become a spectrum when it refracts?
Shorter wavelengths or longer frequencies, refract (bend) more. White light is a mixture of many wavelengths so it splits into a spectrum.
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What is refraction?
Waves changing speed when they enter a new material. They also change direction if the come in at an angle.
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What happens to a wave when it speeds up?
The wavelength increases. Frequency remains the same . Frequency and the speed of the wave are not the same thing. This is because frequency refers to the number of full wave cycles per second and speed is the number m/s a wave can travel.
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When light refracts from a less dense material to a more dense material, what would one observe?
The angle of refraction is less than the angle of incidence.
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What needs to be set up before TIR can happen?
Light needs to be travelling from a dense material to a less dense material.
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What is the critical angle?
The angle of incidence where the angle of refraction = 90* or when the angle of refraction goes along the boundary.
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What should the angle of incidence be more than for TIR to occur?
The angle of incidence needs to be more than the critical angle of the material.
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What is specular reflection?
When all the waves are reflected in a single direction by a smooth surface. Clear reflection occurs.
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What is diffuse reflection?
When light waves are reflected by a rough surface and are reflected in all directions. Matte reflections occur.
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2 parts of sound waves are called...
Compression and rarefactions.
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How does the human ear work?
The sound is captured by the ear and makes the ear drum vibrate at the same frequency. 3 bones amplify the sounds. The sound travels to the cochlea which converts it to electrical impulses which are taken to the brain through the auditory nerve.
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What are the uses of infrasound?
Communication - human use tracking animals, natural hazards emit these waves and can be used for predicting them, Structure of the earth (evidence for)
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What is partial reflection?
Ultrasound waves partially reflect. Some of the incoming wae is transmitted and some is reflected back. This occurs at each boundary.
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What are the uses of partial reflection?
Distance between each boundary can be measured using time taken for reflected wave to return.
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Other cards in this set
Card 2
Front
What is the law of reflection?
Back
The angle of incidence is equal to the angle of reflection.
Card 3
Front
Why does white light become a spectrum when it refracts?
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