Revision Flashcards
List the EM spectrum in order of increasing frequency
Radio, micro, IR, visible, UV, x-ray, gamma
What is a use and a danger of UV
Used in lamps for tanning beds
Can cause skin cancer/blindness
What is a use and danger of microwaves
Cook food
Heats internal tissue
What is a use and danger of gamma rays
Kill bacteria on medical equipment
Causes mutations / cancer
What is a use and danger of IR
Night vision
Skin burns
How do you work out the speed using frequency and wavelength
Speed = frequency x wave length
How do you work out the force
Force=mass x acceleration
State the equation that links acceleration, velocity and time
Acceleration = final velocity - initial velocity/ time
What is Hooke’s law
Force is proportional to extension
How do you know a graph is obeying Hooke’s law
Straight line through the origin
What is a longitudinal wave
Vibrations are parallel to the direction of wave travel
What is a transverse wave
Vibrations are perpendicular to the direction of wave travel
What is a scalar quantity
Quantity has size only
What is a vector quantity
Quantity has size and direction
Define thinking distance
Distance travelled while reacting to situation
