Y8 Phys T1-Light + Sound Flashcards
what is wavelength?
it is the distance between to peaks on a wave
what is amplitude?
Amplitude is the height of a wave
what are the 2 types of waves
transverse n longitudinal
name the light wave and a sound wave
light wave-transverse
sound wave-longitudinal
how to transverse and longitudinal oscillate?
transverse waves-90 degrees
longitudinal-same direction as the travel direction
what are the secondary colours?
magenta,yellow n cyan
what are the primary colours
red,green n blue
what is refraction?
the way which light slows down and changes direction
when do sound waves occur
when there is a disturbance in a solid,liquid or a gas.
where can sound not travel
in space
What two waves can waves behave?
reflection and refraction
what happens when a sound wave reflects off a surface
we hear an echo
what is specular reflection
lift reflects very uniform, off flat,shiny surfaces
what is diffuse reflection?
dull,Uneven surfaces reflect the lights more unevenly
What is the law of reflection?
When light reflects off a surface, the angle of incidence is always equal to the angle of reflection.The angles of incidence and reflection are measured from the normal line. This is an imaginary line at 90° to the surface.
What happens when sound enters the ear?
Vibrates which passes onto the bones and causes them to vibrate. Those bones are connected to the vibrates and turns energy into electrical energy.
What happens once the sound energy turns into electrical energy in the eardrum?
Electrical energy passes along the auditory nerve to the brain that interpret it as a sound
What happens when people get older and need hearing aids?
The bends in the middle begins fuse this means louder sounds and he did to make them vibrate
What can hearing aids help with?
They can help with amplifying sounds and retransmitting them
What happens when a sound is made?
Particles, bunch up and spread out called compressions and rarefactions
The greater the____ of the soundwave,the louder it is
Amplitude
The higher the _____ of the same wave the higher is its pitch
Frequency
What a very high pitches (over 20,000 Hz) called
ultrasound
What’s a very low pitches(less then 20Hz) called?
infrasound
