Heat, sound and light Flashcards
Accommodation
The ability of the lens of the eye to change shape to focus on different distances
Angle of incidence
The angle that an incoming ray makes with the normal
Angle of reflection
The angle that a reflected ray makes with the normal
Angle of refraction
The angle that a refracted ray makes with the normal
Concave lens
A lens that curves inwards and can correct myopia
Conduction
A method of heat transfer in which heat is passed by vibration of particles
Conductor
A substance that allows heat to flow through it
Convection
Transfer f heat in a liquid or gas due to less dense, warmer matter rising and cooler matter falling
Convex lens
A lens that bulges outwards and can correct hyperopia
Critical angle
The angle of incidence of light that produces an angle of refraction of 90 degrees and total internal reflection can occur
Echo
A sound that is reflected and heard a second time
Frequency
The number of waves passing a point every second
Hertz (Hz)
Unit used to measure frequency
Incident ray
Incoming ray
Insulator
A material that does not conduct heat well
Lateral inversion
The sideways or left to right reversal of an image in a plane mirror
Law of reflection
Light is reflected at the same angle that it is incident (i=r)
Longitudinal wave
A wave in which the vibration is the same direction as the wave is travelling
Long sightedness (hyperopia)
The ability to see distant objects clearly and close objects appear blurry
Luminous
An object that releases or emits light
Normal
An imaginary line that is drawn at right angles to a surface that light is incident upon
Plane mirror
A flat mirror
Radiation
Movement of heat in the form of electromagnetic waves, which can travel through a vacuum
Rarefaction
A region of low pressure in which particles are far apart
Compression
A region of high pressure in which particles are close together
Real image
An image formed when rays of light actually meet
Reflected ray
Ray that bounces off
Reflection
The bouncing of light off of something
Refraction
The bending of light as it passes from one substance into another substance with a different refractive index
Refractive index
A measure of how easily light travels through a substance
Reverberation
Length of time a sound can be heard
Short sightedness (myopia)
The ability to see close objects clearly and distant objects appear blurry
Sound wave
Regions of high and low pressure originating from a vibrating object and transmitted through a medium
Temperature
A measure of the average kinetic energy of particles in a substance that results in how hot or cold the substance is
Thermometer
An instrument used to measure temperature
Total internal reflection
When light is completely reflected from the boundary of two substances. It occurs when the angle of incidence is greater than the critical angle.
Transverse wave
A wave in which the vibration is at right angles to the direction the wave is travelling
Virtual image
An image formed in which the rays of light do not actually meet, but only appear to meet at a point inside the mirror
Wavelength
The distance from one peak of a wave to the next
