General facts Flashcards
1
Q
what is useful energy?
A
Energy transferred to where it is wanted in the form it is wanted
2
Q
What does emit mean?
A
To give out radiation
3
Q
How do you work out the efficency of an appliance.
A
Useful energy transfer by a device divided by total energy supplied to the device
4
Q
What is = to the angle of incidence?
A
The angle of reflection
5
Q
What is blue shift?
A
It is the galaxy moving towards us!
This is shown by a decrease in wavelength on elctromangnetic waves.
6
Q
What are the 2 parts that make up a longitiudinal wave?
A
compressions and rarefractions
7
Q
What unit is frequency measured in? How do you work it out?
A
Hertz-Hz and it is measured by dividing the wave speed by the wavelength
