T1 waves Flashcards
what type of waves are sound waves
longitudinal waves
what type of waves are ripples on surface of water
transverse waves
what are the movement of waves called
oscillations
how do sound waves travel by
particles in the air moving side 2 side
what do you call air particles which are close together
compressions
in longitudinal waves the oscillations are what to the direction of energy transfer
parallel
in transverse waves the oscillations are what to the direction of energy transfer
perpendicular
what do you call air particles that are spaced out
rarefactions
what do all longitudinal waves require
a medium to travel in eg air liquid or solid
what is an amplitude
the furthest point a wave vibrated from its undisturbed position
what is wavelength
the distance from one point of a wave to another
what is frequency
number of waves passing a point each second
what is unit for frequency
Hz hertz
what is period
time in seconds for one wave to pass a point
what is wave speed
speed in which energy is transferred
ripple tank practical
what type of waves are electromagnetic waves
transverse waves
what do electromagnetic waves transfer
transfer energy from source to absorber eg microwaves, solar pannels
what does the red end of the spectrum mean
lower frequency
higher wavelength
what does the violet end of the spectrum mean
higher frequency
shorter wavelength
name the whole electromagnetic spectrum
radio
microwaves
infrared
visible light
UV
x rays
gamma rays
what is the speed of electromagnetic waves in a vacume
3 x 10 ^8 m/s
what happens when electromagnetic waves are generates or absorbed
changes take place in atoms of nuclei of atoms
what are the hazards of electromagnetic waves
Gamma rays, x rays, UV: damage the human body
cause cause mutations of genes and risk of cancer
how are radio waves produced
when electrons oscillate in electrical circuits
radio waves
- used to transmit radio and tv signals
- they can travel long distances before being absorbed
- can reflect layer of charged particles into the atmosphere
microwaves
- used to heat food bc most food contain water molecules which is absorb energy of microwaves and cause temperature to increase
3.
infrared
- emitted by electrical heater and used to cook food in ovens. easily absorbed by objects
visible light
- short wavelength can carry great deal of communication
ultraviolet
- created inside bulb
- short wavelength absorbs more energy
x rays and gamma rays
- medical imaging
- very penetrative
- medical treatments