Waves Flashcards
What happens when a wave travels through a substance.
Particles move to and fro
What direction is energy taransfered
In the same direction as the wave is moving in
If a wave has a higher frequency or a larger amplitude does it transfer more or less energy.
More
What can you use high frequency waves for
To agitate a liquid for cleaning objects or to massage muscles for physiotherapy. You can also use waves to create energy.
What does light and other electromagnetic radiation damage
Liver cells
What do low frequency waves damage
Have a heating effect on human tissue
What do high frequency radiation waves cause
It can cause cancer. The
What is a wave
It is a vibration that transports energy from place to place without transporting matter
What happens when waves combine.
They can add up or cancel out
What an x-rays not travel through.
Solids because
What is a sound wave? What does it need to travel
Sound is a longitudinal wave which means it needs a median to travel
What wave is light/what does it not need to travel but can travel with it?
Light is a transverse wave and it can travel without a median.
What frequency is ultrasound
It is 20000 HZ or higher
Can humans hear ultra sound
No
What does the order of the electromagnetic spectrum go in starting with the longest wavelength to the shortest wavelength
Radio waves Micr-waves Infrared Visible light Ultraviolet X-rays Gamma rays
What is a use of radio waves
TV signals
What is a use of microwaves
Mobile phones
What is a use of infrared
Heating and cooking
What is a use of visible light
Photography
What is a use of ultraviolet waves
Detecting forgeries
What is a use of X-rays
Imaging skeleton
What is a use for gamma rays
Killing cancer cells
What is ionisation
Where electrons are knocked off of atoms in cells
What degrees to transverse waves travel at
90
When waves in line with each other are put together what happens
Increase the amplitude of the wave
What happens when waves are not in line and they are put together
Cancel each other out therefore deceasing the amplitude
What is the definition of superpose
When two waves join together
What is the definition of electromagnetic spectrum
the range of wavelengths or frequencies over which electromagnetic radiation extends
What is the definition of compression
When the wavelength is really close together
What is the definition of rarefaction
This is when the wavelength is big
What is the definition of ionisation
Ionisation is the removal of an electron
What is the definition of longitudinal waves
In longitudinal waves, the oscillations are along the same direction as the direction of travel and energy transfer.
