Invisible Waves Flashcards
What waves does sound use?
Compressional waves.
The Law Of Reflection
Angle of incidence equals angle of reflection.
What is the difference between a ray and a beam?
Ray is a thin line of light whilst beam is a thick line of light.
How do conduction, convection and radiation work?
Conduction- particles bump into each other.
Convection- flow of particles.
Radiation- no particles, infra-red.
What are myopia and hyperopia?
Short sightedness and long sightedness.
What does sound travel fasted through?
Solids.
What is frequency?
Number of complete waves that pass in one second. Symbol- f
What is a period?
Time it takes for one complete wave to pass. Symbol- T
What is the wave length?
Distance between corresponding points on successive waves.
What is amplitude?
Maximum displacement of a particle of the medium from its rest position.
What is speed?
Measure of how fast the wave is traveling.
What is the difference between mechanical and non mechanical waves?
Mechanical- oscillate through matter.
Non mechanical- don’t oscillate through matter.
.5, 1.5, 2, 4
Virtual, enlarged, upright, candle side
Real, enlarged, inverted, 2fl
Real, inverted, same size, 2fl
Real, inverted, diminished, 1 and 2 fl
Which lens diverges and which converges?
Concavo-convex, convex
What are optic fibres?
Long thin strands of glass classed in plastic, microphones and computers, light to electrical, can’t bend so that angle is not below critical angle.
Is the image of the fish higher or lower?
Higher
