Waves 1 Flashcards
What do waves do?
Waves carry energy and information (but not matter)
How are waves measured?
An oscilloscope
What is frequency measured in?
Hertz (Hz)
How do you work out wavespeed?
Wavespeed = Frequency x Wavelength (V = Fλ)
How do you work out the frequency of a wave?
Frequency = 1/Time period (T)
True or False all waves can be reflected and refracted
True
What are the uses of radio waves?
Broadcasting and communications
What are the uses of microwaves?
Cooking and satellite transmitions
What is the use of gamma rays?
Sterilising food and medical equipmentm
What is the use of X - rays?
observing the internal structure of objects
What is the use of ultra-violet rays
used to make fluorescent things and can find back note forgery
what is the use of infrared rays
heaters and night vision
what is the use of visible light?
optical fibres and photography
how can microwaves harm you?
internal heating of body tissue
how can infrared harm you?
skin burns
how can ultraviolet harm you?
damage to surface cells and blindness
In what direction does a transverse wave move?
Perpendicular to the direction of energy transport
what is an example of a transverse wave?
light waves
In what way does a longitudinal wave move?
Parallel to the direction of the energy transport
what is an example of a longitudinal wave?
a sound wave
what does the angle of incidence equal?
the angle of reflection
what is the frequency range of a human
20 - 20,000 Hz
