Radiation (EM Spectrum) Flashcards
Give one use of ultraviolet.
- security marking
- detecting forged bank notes
- fluorescent lamps
Which wave in the electromagnetic spectrum has the longest wavelength?
Radio waves have the longest wavelength.
In what way is UV (ultraviolet) a danger?
Too much exposure to UV can cause skin cancer.
Give one application of microwaves.
- heating food
- mobile phone communications
How does UV (ultraviolet) benefit human health?
UV helps generate vitamin D for healthy skin.
What do all waves in the electromagnetic spectrum have in common?
All waves in the electromagnetic spectrum travel at the same speed (the speed of light).
Give one use of infrared.
- thermal imaging
- remote controls
- security systems (motion sensor)
Which wave in the electromagnetic spectrum has the least energy?
Radio waves have the least energy.
Give one use of X-rays.
- medical X-ray scans
- airport security scanners
State a detector of infrared radiation.
- photodiode
- phototransistor
- thermistor
- thermocouple
Give one application of radio waves.
- Broadcasting
- Satellite transmissions
- Communications
What speed do all waves in the electromagnetic spectrum travel at?
All waves in the electromagnetic spectrum travel at the speed of light - 3 x 108 ms-1.
Which wave in the electromagnetic spectrum has the shortest wavelength?
Gamma rays have the shortest wavelength.
How is the frequency of a wave in the e.m. spectrum related to its energy?
The higher the frequency of a wave in the e.m. spectrum, the more energy the wave has.
State a detector of UV (ultraviolet).
Fluorescent material can be used to detect UV.
This can be in the form of special ink, or chemicals in washing powder.