Which arrow represents the change of state described above?
The diagram shows changes of state between solid, liquid,
and gas. The atoms of a substance lose energy during a
change of state. Before the change, the atoms are close
together but are able to slide past one another.
gas
M
N
Р
M

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.