Key Facts Flashcards
1
Q
What is the speed of light in a vacuum?
A
300 million m/s
2
Q
What is the speed of sound in air?
A
343m/s
3
Q
What is the ratio between the speed of something and the speed of light in a vacuum, the fastest travel possible, called?
A
The refractive index
4
Q
Why can’t sound travel through a vacuum?
A
Because there is nothing for the particles/ sound to vibrate so it cannot travel further
5
Q
What is conduction?
A
When heat/ electricity is transmitted through a material which has a difference in temperature (generally cooler)
6
Q
What is convection?
A
The movement caused by hotter less dense air rising and cooler dense air sinking
7
Q
Give the general speeds of walking, running, cars and cycling
A
1.4 walking 13 - 31 cars 5.5 cycling 3 running All in m/s
8
Q
What does a sankey diagram represent?
A
The efficiency of something
