Sound and light Flashcards
Waves are transfers of energy or matter
Energy
Does sound travel better through solids liquids or gasses and why
Solids because the particles are closer together so they vibrate more
What is amplitude measured in
Decibels dB
What decibels are an average room noice
30-50 decibels
Sounds lower that what dB are safe
70 dB and below
Sounds above what dB can harm your hearing over time
70 dB and over
What is volume measured in
Amplitude
What does amplitude depend on
The energy in the vibrations
Does low amplitude have smaller or larger range of movement
Smaller range of movement
Does high amplitude have smaller or larger range of movement
Larger range of movement
Does low amplitude have less or more energy
Less energy
Does high amplitude have less or more energy
More energy
Wavelength is represented by what
Th Greek letter lambda
What is a wavelength
The distance from one point on the wave to the same point on the next wave
What is the top of the wavelength called
The peak or the crest
What is the bottom of the wavelength called
The trough
Amplitude is the distance from where to where
The distance from the middle to the peak or trough
What is frequency
The number of waves that pass a fixed point per second how often something happens
What is frequency measured in
Hz hertz
What is pitch
The high or low tones that you hear
1 hertz =
1 sound wave per second
First part of the ear sound goes through
Collected by the ear lobe or pinna
Second part of the ear sound goes through
Waves travel along the ear canal
Third part of the ear sound goes through
Waves make the ear drum vibrate
Fourth part of the ear sound goes through
The small bones called ossicles amplify the vibrations
5th part of the ear sound goes through
The cochlea turns the vibrations into electrical signals
6th part of the ear sound goes through
The auditory nerve takes the signals to the brain
How do we see non luminous objects
Light bounces off them and into our eyes
Glass and water are
Transparent
Tissue paper what and why
Translucent light is scattered and cannot be seen clearly
A wall is what and why
Opaque no light can travel through it
What direction does light travel in
Straight lines
A lense that bends in is a
Concave lense
A lense that bends out is a
Convex lense
Focal point
Where the rays meet once they have been reflected or refracted
Focal length
The distance between the focal point and the edge of the lense
3 primary colours
Blue red green
3 secondary colours
Cyan magenta yellow
What happens to the size of the shadow when the light source is nearer the object
It gets bigger
What is reflection
When light hits a surface and changes direction making the image appear somewhere else
