Topic 2 - the electromagnetic spectrum Flashcards
What do waves do?
Waves transfer energy and information NOT matter
What is the amplitude?
Half the total hight of a wave
What is the wavelength of a wave?
The length of a full wave cycle measured in metres.
What is the frequency of a wave?
The number of waver per second, measured in hertz (Hz). 1 waver per second = 1 Hz
What is a transverse wave?
Vibration is perpendicular to the direction of travel.
What is a longitudinal wave?
Vibration is parallel to direction of travel
What types of wave are light?
Transverse
What type of wave is sound?
Longitudinal
What are the waves on the electromagnetic spectrum?
Radio waves. Radioactive Microwaves. Monkeys Infrared. In Visible light. Vietnam Ultra violet. Use X-ray. X-ray Gamma rays. Goggles
What happens to wave as you go down the spectrum?
Decreasing wavelength
Increasing frequency
Increasing danger
Which waves are ionising?
Ultra violet
X-ray
Gamma rays
What are the dangers and uses of radio waves?
No dangers.
Used for communications
Satellites
Broadcasting
What are the dangers and uses of microwaves
Dangers: heats the cells
Uses: cooking, mobile phones, satellites
What’s the dangers and uses of infrared
Dangers: skin burns
Uses: cooking, thermal imaging, remote controls, optical fibres, burglar alarms
What are the dangers and uses of visible light?
Dangers: non
Uses: vision , photography, lighting
What are the dangers and uses of ultraviolet?
Dangers: skin cancer, eye conditions
Uses: security marks, fluorescent lamps, water disinfection, forgery detection
What are the dangers and used of X-rays?
Dangers: mutation of cells, leading to cancer
Uses: airport security, imaging broken bones
What are the dangers and uses of gamma rays?
Dangers: mutation of cells leading to cancer
Uses: sterilising food, sterilising medical equipment, detecting cancer, treating cancer.
What are the colours of the rainbow?
Red Orange Yellow Green Battle Indigo Violet
What are the radioactive sources?
Alpha particles
Beta particles
Gamma rays
