Light And Sound Flashcards
Refraction
The bending of light waves when they slow down in a new medium.
Plane mirror
A plane mirror is a flat and reflective surface which reflects light in one straight line.
Cornea
The cornea is the transparent outer part of the eye.
Oscillation
Oscillation is were it moves energy but not a medium.
Speed of sound
Sound travels at 340m/s in air sound travels much faster in liquids, it can travel at 1500 m/s. Sound travels faster through a solid. In metals like steel it can travel at 5000 m/s.
Specular reflection
Specular reflection is when you see a reflection in a flat surface unlike the mirrors that make you look different sizes.
Lens
A piece of glass that you look through to help improve your sight
Pitch
The pitch determines how high or low a sound is.
Audible range
The audible range is how high and low an animal can hear. We can hear 20Hz - 20000Hz.
Diffuse scattering
Diffuse scattering is were a reflective object is not flat and light gets shone on it it goes in different directions.
Retina
The retina is at the back of the eye and the light comes and refracts into each other when they reach the retina so you can see.
Amplitude
Amplitude is the distance between the peak/crest or trough of a transverse wave to the normal.
Vacuum
A vacuum is an air less space were sound cannot travel through.
Law of reflection
Light waves reflect from surfaces. When waves reflect, they obey the law of reflection: the angle of incidence equals the angle of reflection. The normal is a line drawn at right angles to the reflector. The angle of incidence is between the incident (incoming) ray and the normal.
Convex lens
A convex lens is made from a transparent material that bulges outwards in the middle on both sides. It can focus light so that appears to meet at a single point, called the focal point. Light is refracted as it passes into, then out of, the lens.
Frequency
the frequency is the number of waves per second – the higher the frequency, the closer together the waves are and the higher the pitch
Ultrasound
Ultra sound is sound above 20000Hz
Incident ray
A ray of light created on purpose.
Concave lens
Someone with short-sightedness can see near objects clearly, but cannot focus properly on distant objects. This is caused by the eyeball being elongated, so that the distance between the lens and the retina is too great. It can be corrected by placing a concave lens in front of the eye.
Wave length
The wavelength is the length of one point on a wave the same point on the next wave
Echo
An echo is reflected sound
Reflected ray
Reflected ray is when a incident ray hits a reflective object and reflects
Dispersion
Light is refracted when it enters the prism, and each colour is refracted by a different amount. This means that the light leaving the prism is spread out into its different colours, a process called dispersion.
Transverse wave
transverse waves are waves that look like a wave at sea. It moves in a straight line but it wiggles so it becomes bumpy
Reverberation
Reverberation is something that creates the echo that we hear.
Spectrum
Here are the seven colours of the spectrum listed in order of their frequency, from the lowest frequency (fewest waves per second) to the highest frequency (most waves per second):
red, orange, yellow, green, blue, indigo, violet
This mnemonic is one way to remember the order: ‘Richard Of York Gave Battle In Vain’.
Angle of refraction
The angle of refraction is smaller than the angle of incident.
Wave
A wave is something that carries energy but it can’t carry a medium
Medium
A medium is a solid, liquid or gas
Longitudinal wave
A longitudinal wave is a wave that goes in a straight line and vibrates to move so it cannot move outside a vacuum.
Peak/ crest
The top of a transverse wave
Trough
The bottom of a transverse wave
Speed of light
The speed of light is how fast light travels. The speed of light is 300000k/s
