Recent content by Saado

So I take it that energy efficiency is the only reason they're used? I read somewhere (vaguely) about ways that micro and radio interfere with certain things which make it more practical to use microwaves for long distances and radio for short distance communication. Is that right and if so...

Why are raidowaves used for Wifi and Bluetooth but microwaves for satellite communication among other things. I was under the assumption that radiowaves are used for communication only. What are the factors which play into this decision. Also, is there a link between frequency of a wave and the...

Thank you both. That helped a lot.

A lot of the less maths-y definitions of entropy talk about disorder and how disordered a system is. I'm given to understand that entropy is a measure of energy over temperate. Could someone clear up these misconceptions? I don't understand why 'disorder' is used. Isn't that subjective? Second...

So the temperature is the absolute temperature before the heat energy is transferred into the system?

Whilst I understand that entropy is a measure of the number of specific ways in which a system may be arranged. The units for entropy don't make sense to me intuitively. Why joules per kelvin? What way at all does that show how "disordered" a system is. When I hear joules per kelvin, I think of...

I have say a 250cm3 liquid with a solid dissolved inside filled in a container. If I pour 50cm^3 of that liquid in another container, would the number of moles of the solid inside the 50cm^3 container be different to the number of moles in the original 250cm^3 container? I've been told the...

THANK YOU! I don't know why I didn't think of that before. Yes, this makes perfect sense.

Right, I understood that much. Maybe I should have expressed my query better. As a test of algebra, I was given the above equation: (P + a (n/V)^2) (V - n b) = n R T With absolutely no context and told that a and b are constants. I recognized the other terms from eqns like PV=nRT and pv=1/3...

Would that not simply be the units for volume? meter cubed per mol? Could you take me through the steps of why that is the case using algebra? It isn't intuitive to me at the moment.

Yeah I know that. How would I go about getting the units of a and b from the units above? It seems to me that when I try to re-arrange, I'll always have 2 unknowns (a and b) so I can't work out the individual units for those constants

How would I go about calculating the units for the van der waals constants if I have 2 unknowns? (a and b) (P + a (n/V)^2) (V - n b) = n R T p=Pressure v=Volume n=moles R=gas constant T=temperature

Oh I see my problem. I read the graph as the magnitude increasing but realized that's wrong. Thank you.

This is not a homework question. Whilst looking over at previous exam papers on classical physics, I came across this question in the attachment. I always assumed gravitational potential energy increased as you moved further away from a mass. But the expected answer to this question shows the...

Sorry my bad I meant the amplitude of the oscillations.