Section C Waves And Sound Flashcards
What is wavelength on a sound wave graph?
The distance from one peak to the next.
How do you measure the wave speed?
Wave speed = frequency x wavelength
Which wave has the shortest wavelength?
Gamma.
Which wave has the longest wavelength?
Radio.
Give a use for gamma rays.
Sterilising food and medical equipment.
What are radio waves used for?
Communications.
What are microwaves used for?
Satellite communication and to heat up food (by absorbing water molecules).
What are infrared radiation waves used for?
Hearing and to monitor temperature.
What is visible light used for?
Photography.
What are UV rays used for?
Fluorescent lamps (which are safe because the waves are absorbed by a phosphor coating).
What is a use for X Rays?
They let us see the internal structure of objects and materials.
What is a danger of microwaves?
They can heat human body tissue.
What is a danger of infrared waves?
Can burn skin.
What is a danger of UV Rays?
Damage surface (skin) cells and cause blindness.
What is a danger of gamma rays?
Cell mutation (tissue damage leading to cancer).
