Activate 1 - Chapter P2 & 3 - Waves Flashcards
Refraction
The bending of light waves when it slows down from another medium.
Plane Mirror
It is a mirror with a flat and reflective surface.
Specular Reflection
It is a reflection from a smooth surface.
Diffuse scattering
It’s a reflection from a rough surface.
Law of reflection
The angle of incidence is equal to the angle of reflection.
Incident Ray
A ray coming out of a source of light.
Reflected ray
The ray that is reflected from a surface.
Angle of refraction
The angle of refraction is the angle that shows how much the light has bent going through an object.
Medium
The object that affects light or sound by slowing it down or transferring from the wave.
Cornea
The transparent layer at the front of the eye.
Lens
A device made of shaped glass that focuses light rays from objects to form an image.
Retina
The layer of light sensitive cells at the back of the eye.
Convex Lens
A lens that produces converging rays of light.
Concave Lens
A lens that produces diverging rays of light.
Dispersion
The splitting up of a ray of light of mixed wavelengths by refraction into its components.
Spectrum
A band of colours produced when light is spread out by a prism.
Wave
A vibration that transfers energy.
Peak/Crest/Trough
Peak and Crest: Top of a wave
Trough: Bottom of a wave
Oscillating
Oscillating is a different word for vibration.
Pitch
A property of sound determined by its frequency.
Amplitude
The distance from the middle to the top or bottom of a wave
Frequency
The number of complete waves or vibrations produced in one second (measured in hertz).
Wave Length
The distance between two identical points on a wave.
Transverse Wave
The vibrations at right angles to the directions the wave moves.
Longitudinal Waves
A wave where the vibrations are in the same direction as the direction the wave moves.
Speed of light
The distance light travels in one second (300 million m/s).
Speed of sound
The distance sound travels in one second (330m/s).
Audible Range
The range of frequencies that you can hear.
Vacuum
A space in which there is no matter.
Ultrasound
Sound at a frequency greater than 20 000 Hz, beyond the range of human hearing.
Echo
A reflection of a sound wave by an object.
Reverberation
The persistence of a sound for a longer period than normal.
Loudness
How loud you perceive a sound of a curtain intensity to be.
Microphone
A device for converting sound into an electrical signal.
Oscilloscope
A device that enables you to see electric symbols , like those made by a microphone.
Hertz
The unit of frequency (Hz).
Kilohertz
1 kilohertz (kHz) = 1000 hertz (Hz).
Infrasound
Sound below a frequency of 20 Hz.
Ear
The organ in your body that detects sound.
Pinna
The outside part of the ear that we can see.
Auditory Canal
The passage in the ear from the outer ear to the eardrum (Tympanic Membrane).
Eardrum (Tympanic Membrane)
A membrane that transmits sound vibrations from the outer ear to the middle ear.
Outer Ear
The pinna, auditory canal and eardrum (tympanic membrane)
Ossicles
The small bones of the middle ear (hammer, anvil and stirrup) that transfers vibrations from the eardrum to the oval window.
Middle Ear
The ossicles (small bones) that transfer vibrations from the outer ear to the inner ear.
Amplify
To increase the amplitude of a sound so that it sounds louder.
Oval Window
The membrane that connects the ossicles to the cochlea.
Auditory Nerve
An electrical signal travels along the auditory nerve to the brain.
Inner Ear
The semi circular
