Light and Sound ETT Flashcards
Light and Sound End of Topic Test
How does increasing a sound waves amplitude effect the sound?
The volume increases.
What is Wavelength?
The length of one wave, from peak to peak or trough to trough.
What is frequency measured in?
Hz, Hertz
What will a wave with a high frequency sound like?
High pitched.
What will a wave with a low frequency sound like?
Low pitched.
What is it called when a sound wave gets reflected?
Echo
Why are Echo’s always quieter than the original noise?
Some of the sound waves energy is absorbed into the surface of the material that the wave is bouncing off.
What is echo location?
Using the time it takes an echo to be received to calculate the distance from a surface.
Through which state does sound travel fastest?
Solid.
Why does sound travel faster in water than in air?
The particles in water are closer together so it takes less time for each particle to transfer its energy to the next one.
Name the 2 types of wave.
Transverse, Longitudinal
In what direction do the particles oscillate in a transverse wave?
At 90 degrees to direction of the wave.
In what direction do the particles oscillate in a Longitudinal wave?
Parallel to the direction of the wave.
What type of wave is a sound wave?
Longitudinal
What causes a sound wave?
A vibration
Why cant a sound wave travel through a vacuum?
There are no particles to transfer the energy.
What do all waves transfer?
Energy
What is the speed of sound in air?
340 m/s
Why do you see the flash of a firework before you hear the BANG!?
Light travels much faster then sound.
Which part of the ear moves first when receiving a sound wave.
The ear drum.
What is an echo?
A reflected sound wave.
What is ultra sonic?
A sound with a frequency above 20 000 Hz
What equation can you use to find the distance a sound wave has travelled?
Speed (m/s) = Distance (m) / Time (s)
Describe a low pitched loud sound wave.
A wave that has a large amplitude and a low frequency.
Describe a high pitched quiet sound wave.
A wave that has a low amplitude and a high frequency.
What is the name of this part of the ear?
Auditory canal
What is the nam of this part of the ear?
Ear Drum
What is the name of this part of the ear?
Ossicles
What is the name of this part of the ear?
Semi-Circular Canals
What is the name of this part of the ear?
Cochlea
What is the name of this part of the ear?
Auditory nerve
Define Luminous
Something that gives out light
Define Non Luminous
Any object that does not give out light.
How do we see non luminous objects?
Light reflects of of the object and into our eyes.
Define Transparent
Materials that allow light to pass through easily, the material does not absorbe very much of the light energy.
Define Translucent
A material that allwos light to pass through but scatters the direction og the light so that you do not see a clear immage.
i.e frosted glass
Define Opaque
A material that does not let light pass through.
How does light travel?
Light travels as a wave.
Name the muscle that controls the size of your pupil.
Iris
Name the two types of photo receptor in your eye.
Rods and Cones
What is the name of the back of the eye where immages are recieved?
Retina
What is white light made up of.
Aspectrum of coloured light.
What piece of equipment can be used to separate white light?
Prism
Name the two types of reflection.
Specular reflection
diffuse reflection
What type of reflection gives a clear immage.
Specular reflection
What type of reflection do you get from a rough surface?
Diffuse reflection.
What is the Law of reflection?
Angle of Incidence = Angle of reflection
Define refraction.
Light changing direction as it travels through a medium with a different density.
Name the two types of Lens.
Convex and concave
What is the name of the point where rays of light converge behind a lens.
Focus or focal point.
Why does the grass look green.
White light from the sun hits the grass all of the coloures of the spectrum of light are absorbed by the grass execpt for green light which is reflected.
H
How do light filters work?
They only transmit the same colour of light that they are and absorb the rest.
How far behind a mirror does an object appear?
The same distence as the object is infront of the mirror.
