Physics Flashcards
What is a wave
A movement of energy
How is energy transferred
WAVES
Heating
Forces
Electrical current
What is sound caused by
Vibrations
What do vibrations travel through
Medium
What is a medium
Contains particles
How is sound caused
The vibration of an object and particles, which creates sound waves, energy is transferred during this process and can only work by vibrations in a medium
What sort of wave is sound
Longitudinal wave
Which direction does a longitudinal wave energy travel
Energy transfer is parallel to the direction the wave travels
What is a wave made of
Compression
Rarefaction
What is a light wave
Transverse wave
What direction does energy transfer happen in a light
Energy transfer is perpendicular to the direction the wave travels
What is an echo
A hard reflected sound wave
Which surface will create an echo
A smooth, hard and flat surface
Which surface absorbs sound
Rough surface
What happens when a wave is absorbed
It absorbs energy transferred into it and the tempature of the substance increases
Speed of sound
Distance=speed/time
Sound will travel the fasyesy through…
A solid because the particles physically touch and vibrations can be passed from particle to particle easier
Why can’t sound travel through a vacuum
There are no particles to vibrate and pass on the energy
Who is echolocation used by
Dolphins, bats and submarines
What is frequency
Frequency is the pitch of a sound
Sound more waves mean a…
Higher pitch frequency
What is frequency measured in
Hertz
What is pitch affected by
The speed of vibrations
What is volume determined by
The amplitude of a wave and the size and energy of the vibrations
What is volumes determined in
Decibels (dB)
What is amplitude
The distance of particles that are displaced by vibrations
How does amplitude happen
The more vibration, the more energy created in the particles and then the particles are displaced by vibration creating a louder sound
How quick to light waves travel
300000000
What pattern are the waves for light waves
Straight lines
What is light measured in
Lux
Angle of reflection and angle of incidence…
Are the SAME
Which objects reflect light the best
Smooth shiny surfaces
Pale colours
Clear images as they reflect light regularly
Objects that do not reflect light well
Rough Matt surfaces
Dark colours
Give no or diffuse images
What is refraction
When light bends
Why does it happen
The light CHanges speed
What happens when light enters a more dense medium
It bends away from the normal
What does tagaga stand for
Towards air glass away glass air
What is the electromagnetic spectrum
Radio microwave infrared visible light untravidet X-ray gamma ray
What is a prism
It splits a ray of white light into a spectrum of colours, known as dispersion
Wavelength in colour
Each colour has a slightly different wavelength, red has longest wavelength and refracted least
How are colours made
By mixing other colours of light
What are the 3 primary colours
Blue red and green
How is black made
Absorbs all wavelengths of light
How is white made
Object will absorb no colour and therefore all of the light
