electromagnetic spectrum

Created by

Arshini Gandra

Cards (29)

Electromagnetic spectrum 
long wavelength, low frequency
radio waves
micro waves
infra red
visible light
ultra violet
x-rays
gamma rays
short wavelength, high frequency
the higher the frequency of the EM wave, the more energy it transfers
EM waves are transverse waves
wavelength = distance between two consecutive peaks or troughs
infrared - thermal radiation or heat, makes you fell warm
electromagnetic waves are transverse waves
radiowaves are transmitted thrugh the body without being absorbed
some wavelengths of microwaves can be absorbed, causing heating of cells, which may be dangerous
What type of waves are electromagnetic waves?
Transverse waves
What do electromagnetic waves transfer from the source to an absorber?
Energy
What is a common property of all electromagnetic waves?
They can travel through a vacuum
How do electromagnetic waves with shorter wavelengths compare in energy?
They carry higher energy
Which types of EM waves have shorter wavelengths?
UV, X-rays, and gamma rays
What happens to the energy of electromagnetic radiation as frequency increases?
The energy increases
What is the relationship between frequency and wavelength in the EM spectrum?
Higher frequency means shorter wavelength
What are the effects of higher energy radiation on cells and tissues?
They can cause cancer
What is the longest wavelength color in visible light?
Red
How are wavelength and frequency related?
They are inversely proportional
What are the uses of different electromagnetic waves?
Microwaves: Heating food, WiFi, Bluetooth
Radio waves: Communication (radio, TV)
Infrared: Thermal imaging, night vision, heating
Visible light: Seeing, photos, videos
UV: Security marking, sterilization
X-rays: Medical imaging, airport security
Gamma rays: Treating cancer, sterilizing instruments
What are the dangers of UV radiation?
Eye damage, sunburn, skin cancer
What can X-rays do to living cells?
They can kill healthy cells
What is a common use of ultrasound in medicine?
Constructing images of a fetus
How does sound travel in different states of matter?
Faster in solids than liquids, faster in liquids than gases
What is the function of an ultrasound detector?
It produces and detects ultrasound waves
How does an ultrasound scanner build an image?
By calculating distances from tissue boundaries
What happens to ultrasound waves at tissue boundaries?
They are reflected back to the transducer
Why is ultrasound considered non-invasive?
It does not penetrate the body
How do radio waves get transmitted from an antenna?
By oscillating charge creating waves
What occurs in a receiving aerial when it absorbs radio waves?
It creates an alternating current