Waves Flashcards
Frequency = ??
Frequency = speed / wavelength
What speed do waves travel at?
The speed of light - 300,000km/s
Order of electromagnetic spectrum in decreasing wavelength and increasing frequency
Radio waves Microwaves Infrared Visible Ultraviolet X-rays Gamma rays
Use of radio waves
Broadcasting and communications
Use of microwaves?
Cooking and satellite transmissions
Use of infrared?
Heaters and night vision equipment
Use of visible light
Optical fibres and photography
Use of ultraviolet
Fluorescent lamps
Use of x rays
Observing the internal structure of objects and materials and medical applications
Use of gamma rays
Sterilising food and medical equipment
Results of excessive exposure to Microwaves Infrared Ultra violet Gamma rays
Microwaves: internal heating of tissue
Infrared: skin burns
Ultra violet: damage to surface cells and blindness
Gamma rays: cancer, mutation
Who found radio waves?
Heinrich Hertz in 1888 and when
Who found visible light?
Newton
