# Two Questions on Waves and Polarised Light

• Air
Not experiment. I meant that in any system using waves for example radio waves, they would use pulses to avoid interference if they used waves. What I didn't understand was the difference between pulse and waves.f

#### Air

I have two questions that are slightly unrelated to each other which has confused me while I was doing revision.

So I understand that if waves are transmitted (e.g. radio waves) then some interference would occur and not be able to give perfect result for any experiment conduced so pulses are used. What are pulses? How do they differ to a wave?

Also, when talking about polarised light, many question ask to draw how polarised light differs from unpolarised light and I draw it like this:

But one mark is awarded for showing vibration and oscillations on the diagram, how do I do that?

So I understand that if waves are transmitted (e.g. radio waves) then some interference would occur and not be able to give perfect result for any experiment conduced so pulses are used. What are pulses? How do they differ to a wave?

That's a little ambiguous to answer.. what kind of experiments are we talking about here? Pulses of light are essentially packets as opposed to a continuous wave-train.

But one mark is awarded for showing vibration and oscillations on the diagram, how do I do that?

You have already shown that in your diagram by having arrowheads at each end. Most diagrams I have seen display unpolarised light as you have drawn.

EDIT: I suppose you could say that the centre of your diagram is the propagation axis, that may clarify it further.

That's a little ambiguous to answer.. what kind of experiments are we talking about here? Pulses of light are essentially packets as opposed to a continuous wave-train.

Not experiment. I meant that in any system using waves for example radio waves, they would use pulses to avoid interference if they used waves. What I didn't understand was the difference between pulse and waves. You said they are packets, what do you mean by that?