P6 waves Flashcards
The maximum displacement of a point on a wave away from its undisturbed position is the…
Amplitude
The distance from a point on one wave to the equivalent point on the next wave is the …
wavelength
The number of waves passing a point each second is the…
Frequency
Name an example of a longitudinal wave
Sound
Name an example of a transverse wave
light, water, any electromagnetic
Oscillations are along the same direction as the direction of travel is a _________ wave
longitudinal
Oscillations are at right angles to the direction of travel in a ____________ wave
transverse
The time needed for one wave to pass a given point is the…
period
The region in a longitudinal wave where particles are closest together is a …
compression
The region in a longitudinal wave where particles are furthest apart is a…
rarefaction
An object is said to _________ radiation when energy from an EM wave is taken up by the object
absorb
An object is said to _________ radiation when a wave can pass through the object
transmit
The process taking place when a wave bounces off of a surface
reflection
The process taking place when a wave enters a different density medium and changes direction
refracion
Refraction changes both the _________ and ___________ of a wave
direction and speed
Which two angles are equal in reflection
angle of incidence and angle of reflection
Write the equation linking frequency, wavelength and wave speed
v = fλ
What is the unit of frequency?
Hertz (Hz)
What is the unit of wavelength?
metres (m)
What is the unit of wave speed?
metres per second (m/s)
What is the speed of electromagnet radiation?
300 000 000 m/s
What is the EM radiation with the shortest wavelength?
gamma
What is the EM radiation with the longest wavelength?
Radio
What is the EM radiation with the highest frequency?
Gamma
What is the EM radiation with the lowest frequency?
Radio
List the EM spectrum from long to short wavelength.
Radio, microwave, infrared, visible, UV, X-rays, gamma
Can EM waves travel through space?
yes
Can sound waves travel through space?
no
Does a sound wave travel faster in water or air?
water
Name a use of radio waves
TV and radio transmission
What EM wave is used for satellite communication?
microwave
Give one use of microwaves
cooking food
Give two uses of IR radiation
electrical heaters, infrared cameras
Give a use of visible radiation
Fibre optic communications
Which radiation is used in sun tanning?
UV
Give one use of X-rays.
Medical imaging
Give one use of gamma rays
Medical treatments
Why are X-rays good for taking images of bone?
absorbed by bone but transmitted through soft tissue
Why are gamma rays used in medical treatment?
Can kill cancer cells
What are the risks of exposure to UV radiation?
Premature skin aging, increased risk of skin cancer
What are the risks of exposure of X-rays?
X-rays are ionising so can cause mutations which may result in cancer
What are the risks of exposure to gamma rays?
Gamma rays are ionising so can cause mutations which may result in cancer
