waves Flashcards
transverse and longtitudinal
what is an transversal wave
ocsillations are perpendicular to the direction of energy transfer
what is an longtitudinal wave
oscillations are parallel to the direction of energy transfer
what is an oscillation
A wave movement up or down
what direction are oscillations in a transverse wave
Perpendicular
what direction of oscillations in a longtitudinal wave
parallel
what is the equation for wavespeed
wavespeed equals frequency times wavelength
What is a wavelength
distance between the same points on two consecutive waves
What is an amplitude
distance from the middle line to the maximum displacement , crest or trough
What is frequency
the amount of waves that pass a single point per second
What is a period
the time taken for each point to completely pass a single point
An increase in frequency….
velocity increase
wavelength increases…
velocity increases
2 Types of transverse waves
. Electromagnetic wave
. Seismic-s waves
2 Types of longtitudinal waves
.Sound waves
. Seismic=p waves
What are the two types of a longtitudinal wave called
. rarefractions and Compressions
What does a wave transfer
Energy
What word is used to describe when a wave bounces off a surface
Reflection
What type of spectrum do electromagnetic waves form
A countinous spectrum
Order the types of electromagnetic radiation from lowest to highest frequency
Radiowaves
Microwaves
Infrared
Visible light
Ultraviolet
X-rays
Gamma-rays
How do the speeds of electromagnetic radiation differ in a vaccum and in air
Electromagnetic radiation all travel at the same speed in a vaccum and in air
In which directions do waves refract when entering a denser medium
They bend towards the normal
The angle of refraction is less than the angle of incidence
In hospital gamma rays are used to…
.Preform medical treatment
. Treat cancer
What health affects can ultra violet waves cause…
. Causes skin to age prematurely
. Increase risk of developing skin cancer
What health affects can x-rays and gamma-rays cause…
. They are both ionising radiations, so can cause mutations in genes
. They can lead to increase risks of catching various cancers
GIve three practical uses for infrared radiation
.Electrical heaters
.cooking food
.infrared cameras
Give three practical uses for Microwave radiation
. Sattelite communications
.Cooking food
Give two practical uses for radio waves
. television transmission
. Radio broadcasts
What is used to transmit data really quickly over any large distances , UV light
Optical fibres
X-rays,gamma-rays,UV lights are all…
.Ionising radiation
.Can cause us harm and damage are cells
In a hospital gamma rays are used for..
.medical treatments
What do all bodies (objects) emit and absorb
infrared radiation
what happens to the quantity of infrared radiation emitted by an object as temperature increases
The hotter the object,the more infrared radiaition it will emit.
What is a perfect black body
An object that absorbs all of the radiation that is on it.
Why is black body the best possible emitter of radiation
.It absorbs all radiation on it
.A perfect absorber of radiation is also a perfect emitter
Other than the intensity of radiation emitted , how does increasing the temperature of an object effect its emissions
The wavelength and intensity of any emission is dependant on the objects temperature
what is a sound wave
A wave of compression and rarefraction by which sound is propagated in an elastic medium such as air.
What is a light wave
a type of electromagnet radiation that can be detected by the eye . it travels as a transverse wave.
unlike sound waves light waves do not need a medium to pass through
