1
Q
what speed to electromagnetic waves travel in a vacuum
A
30,000,000 m/s - 30 million m/s
2
Q
what are the only wave humans can see
A
visible light
3
Q
which colour has the shortest wave length
A
violet
4
Q
what colour has the longest wave length
A
Red
5
Q
which colour is the hottest
A
red
6
Q
which colour is the coldest
A
violet
