Waves Y8 Flashcards
(24 cards)
Define compression and Rarefication
Regions of high and low air pressure.
What is the frequency of an ultrasound
Above 20,000Hz
State the use of an ultrasound
Scientists use ultrasonic cleaning to clean parts of their equipment that need to be very clean.
Physiotherapists use them to make water molecules move faster and get warmer.
Describe how a microphone works
A microphone converts changes in air pressure to a changing potential difference.
When a singer sings into a microphone the sound wave hits a flexible plate called a diaphragm. it produces a changing potential difference
Air molecules move _____
Forwards and backwards
State the waves of the electromagnetic spectrum
Radio waves
Microwaves
Infrared
Visible light
Ultraviolet
X-rays
Gamma rays
What is ionisation
Waves with a low frequency and energy have a heating effect, but waves with a higher energy can knock electrons out of atoms in living cells.
Write down the direction of oscillation in a transverse wave.
90 degrees to the direction of the wave
Write 2 things that happen when waves combine
They superpose
They either cancel out or add up
What are the 2 types of wave
Transverse and longitudinal
What travels faster light or sound
Light
The angle of incidence is equal to the angle of _____
Reflection
True or False. Red boots absorb red light
False
What causes the spectrum of light we see in rainbows?
Dispersion
Can you hear sound in a vacuum?
No
The bigger the amplitude the ____ the sound
Louder
An image in the back of your eye is actually _____
Upside down
Sound travels fastest through ______
Solids
Then liquid and gases
We detect sound waves using our _____
Ear drums
Frequency is measured in _____
Hertz (Hz)
Sound can be reflected to cause an ______
Echo
A red boot through a green filter appears _____
Black
Light waves are ___
Transverse
Sound waves are _____
Longitudinal
