Yr 9 end of year test Flashcards
What is wavelength
The distance between two points after which the pattern repeats itself
What is amplitude
The distance between the undisturbed position(middle) and the peak or crest of the wave.
What is frequency
How many waves occur each second
What is period
The time it takes for an oscillation(one up and down to occur)
What is a transverse wave?
Particles move perpendicular to the energy(up and down)
What is a longitudinal wave
Particles move parallel to the direction of the the energy(back and forwards)
What is a mechanical wave?
A wave where vibrations travel through a medium(a substance)
What are electromagnetic waves?
These are waves that travel through a vacuum, no medium(substance) is needed
List the electro magnetic wavelength from largest wavelength to smallest wavelength
Radio waves, microwaves, infra-red, visible light, ultra-violet, x-rays and gamma rays
How are electro magnetic spectrum the same.
They all are waves
What is different about electro magnetic waves
The wavelength radio waves go from 50cm to gamma rays which have a wavelength of 10 pilometers
Why is the electro magnetic spectrum dangerous
They can damage cells
The is the wave speed equation
Speed=frequency x wavelength
What is the relationship between frequency and period
Frequency =1/period
Period=1/frequency
Which different surfaces absorb and emit infrared radiation more or less effectively
Dark and matt materials are good at emitting and absorbing infrared radiation
Light and shiny materials are bad at emitting and absorbing infrared radiation
What is the difference between scalar and vector
Scalar quantities just have magnitude(eg temperature or mass) but vector quantities have direction and magnitude (eg friction)
What is the equation the ties weight, gravity and mass together?
Weight=mass x gravitational field strength
What is the difference between weight and mass
Weight is dependent on gravity and measure how much gravity is pulling something down and mass is how much stuff is in something
What is the units for mass and weight
Mass is measured in grams, weight is measured in Newton’s
What is the equation for kinetic energy
Kinetic energy= 0.5 x mass x speed(squared)
What is the equation for gravitational potential energy
Gravitational potential energy =
mass x gravitational field strength x height
What is the equation for elastic potential energy
Elastic potential energy =
0.5 x spring constant x extension(squared)
What is the equation for work done
Work = force x distance
