Recent content by EmmaLemming

Homework Statement Neon is a monatomic gas; Density = 0.900 kg.m-3 Pressure = 1 atm Temperature = 273K. Density of liquid neon = 1207 kg.m-3 (i) Calculate the volume occupied by one gram mole of neon at a temperature of 273 K and a pressure of 1 atm. (ii) Determine the atomic...

Yaaay :) Thanks very much for your help.

I did, 40/(6.02 x 1023) = 6.64 x 10-23 kg, to get the mass of one argon atom. Now that I think about it though should it be, 0.04/(6.02 x 1023) = 6.64 x 10-26 kg.

Hello :) Thanks for you're help So for part (a) could I just divide the atomic density by the mass? I've seen before that atomic mass, 40, can be written as 0.04kg however I thought, mass = M/avagadro = 6.64 x 10^-23kg Which mass do I use? :s

Homework Statement Argon (atomic weight 40) exists as a monatomic gas at room temperature and pressure. The density of liquid argon is 1784 kg m−3. (a) Calculate the atomic density (atoms m−3) in liquid argon. (b) Calculate the atomic density (atoms m−3) in gaseous argon at a pressure...

Okay, so I assume that minimum energy is 0 and then write, hc/σ = λ I get, λ = 5.4 x 10-7 m That seems reasonable , right? I don't know the answer to your last question.

Homework Statement a) Write down the formula that relates the maximum electron energy, Emax. to the frequency of the incident light in the photoelectric effect. b) Calculate the maximum wavelength of light for which photoemission occurs for light incident on a metal whose workfunction...

oh dear.. So do I have to find out what C and D are? ... How? And I put "= 1" on the RHS because ∂2f(x,t)/∂x∂t = xt I thought integration of 'xt' wrtx and then t equates to 1..? Is that incorrect?

Ahh is it really that simple? Awesome :) I thought there was more to it than that. I get, f(x,t) = 1/4(x2t2) + Ct + D = 1 Does that seem reasonable? Do I need to do anything else? Thank you for your help :)

General solution to a 2nd order differential :( Homework Statement What is the general solution of ∂2f(x,t)/∂x∂t = xt ? Homework Equations The Attempt at a Solution I have no idea, I tried to follow an example out of the book but it was quite different to this question. Do...

I thought that but I don't know how to write it out like that.. Is my lecturer correct in his definiton of the x-component? and if so do you know how he got it to be that? and yes ^ means cross product I didn't want any confusion with multiplication.

Homework Statement For arbitrary vector fields A and B show that; ∇ ^ (A^B) = (∇ . B)A - (∇.A)B + (B.∇)A - (A.∇)B Homework Equations where (A.∇)B = ((A.∇)Bx, (A.∇)By, (A.∇)Bz) and (A.∇)f = Ax δf/δx + Ay δf/δy + Az δf/δz = (Ax, Ay, Az)( δf/δx, δf/δy, δf/δz)f The Attempt at a...

Sorry if I'm being slow and thanks for your help. but would one of the sections be an integral between a and -a ? Do I do that and then integrate between -∞ and ∞?

I don't know. This is just a guess would it be, between 0 and a ∫ A sin (3∏x/a) dx This is where I get confused, because I thought to do this question all I have to do is square the wavefunction and integrate between -∞ and ∞. Is there another step before hand?

Ah ok, I thought the wave function wouldn't exist outside of the square well so the wave function would be zero..? I got the sin (3∏x/a) wavefunction given to me in the question so I just took it as true.