5.6: Making simple calculations Flashcards
1
Q
What is reflection?
A
bouncing back of light/sound waves when it strikes a surface
2
Q
What is an echo?
A
reflection of sound wave
3
Q
What is mach?
A
The ratio of relative speed to the speed of sound [330m/s]
4
Q
What is supersonic?
A
Speed faster than the speed of sound
5
Q
How fast does sound travel in 100m?
A
0.3 secs
6
Q
How fast does light travel in 100m?
A
0.0000003
7
Q
How many times is the speed of light faster than the speed of sound?
A
1 million times faster
8
Q
What plane was the first to fly at supersonic speed?
A
The Bell X-1 on 14/10/1947, by Major Charles E.
Yeager. It could go up to 1,541 km/h
9
Q
What land vehicle was the first to go at supersonic speed?
A
The Thrust SSC, a Twin turbofan jet-powered car, on 15/10/1997, by Andy Green. It could go up to 1,228 km/h
