Electromagnetic Spectrum Flashcards
Longitudional wave
Waves travel in the same direction as the energy being transferred. E.g. sound waves
Transverse wave
Waves travel at right angles to the direction the energy is being transferred. E.g. waves of visible light, waves on the electromagnetic spectrum.
Wavelength
The distance between a point on one wave and the same point in the next wave.
Peak
The highest point of the wave.
Amplitude
The highest point from the undisturbed position.
Trough
The lowest point of the wave.
Frequency
The number of waves produced per second.
Measuring waves formula
Wave speed = frequency*wavelength
Reflection
- The angle of the incidence is always less than 90
- the angel of incidence is always equal to the angel of reflection
Refraction
Is a change of the direction of travel of waves when they cross a boundary between one medium and other medium.
Diffraction
Spreading the waves when they pass trough a gap or move past an obstacle. The waves spread out without changing their speed, wavelength or frequency.
Refractive index
Sin(I):sin(r)
Electromagnetic spectrum order 7
Radio waves Microwaves Infrared Visible light Ultraviolet X-rays Gamma rays
UV light
- Sun beds
- security pen
- fluorescent light
- sunburn
- skin cancer
- eye cataracts
- premature aging of the skin
Gamma rays
- radio therapy
- sterilize food
- radiation infection
- cancer
Miro waves
- WiFi
- mobile phones
- used to fix traffic signals
-can cause cataract in eye
Infrared radiation
- security alarms
- burglar alarms
- data links over short distance
- cause internal burn of body tissues
- it can cause skin burn
X-rays
- used to check breaks
- penetrate less dense matter
- leave an image on photographic paper
- cancer
- can harm baby in pregnant woman
Visible light
- to see things
- light bulbs
- lathe spotlights
-too much light can damage the retina in eye
Radio waves
- transmit television and radio programs
- cellular telephoning
- break down tissue in the body
- may cause brain tumors
- increase the body temperature
