Waves Flashcards
What equation links wave speed, frequency and wavelength?
Wave speed = frequency x wavelength
What equation links frequency and time period?
Frequency = 1 / time period
What equation links refractive index, angle of incidence and angle of refraction?
n = sin i / sin r
What equation links refractive index and critical angle?
sin c = 1/ n
What are uses of radio waves?
- Broadcasting
- Communications
What are uses of microwaves?
- Cooking
- Satellite transmissions
What are uses of infrared?
- Heaters
- Grills
- Remote controls
- Thermal imaging
- Night vision equipment
What are uses of visible light?
- Optical fibres
- Photography
What are uses of ultraviolet?
- Fluorescent tubes
- Tanning
- Security markings
What are uses of x-rays?
- Observing internal structures of objects and materials
- Studying atomic structure of metals
What are uses of gamma rays?
- Kills bacteria in food
- Sterilise medical equipment
- Treats tumors
What are dangers of radio waves?
Probably none
What are dangers of microwaves?
Internal heating of body tissues
What are dangers of infrared?
Causes burning of tissues
What are dangers of visible light?
Very bright light can damage eyes
