Recent content by NUFC

Hi Rajini, I have tried to follow your simple steps but unfortunately am still baffled, I find it dificult to get my head around this type of problem!. What I have is 1) Er = 1/2mv^2 2) Pa = (M(atom) + M(photon))v(atom) - now not sure how to relate this with 1 3) Pp = gammaM(photon)V(photon)...

Homework Statement I have a question to answer but am struggling to even start it. The question is basically an atom absorbs a photon (energy E), rest mass of atom is m, find recoil velocity in terms of E and m after absorption. Homework Equations i think i need th emomentum of the...

Ah ha, i follow now. Thank you very much for your help, much appreciated.

i see what you are saying. but does this mean i am on the right lines by assuming that if i calculate the LF in the frame of the observer it also applies to the rocket? I apologise but i really cannot get my head around this for some reason.

Apologies but in the equation i have just posted i have used 12 years it should in fact be 6 years which gives a proper time of 3.35 years.

thank you for that, it shows you shouldn't dismiss something because it looks too obvious - doh! if i use the velocity from observers viewpoint (0.83) and rearrange the time dilation eqn for t(proper) ie the time on the rocket clock [t(rocket) = t(observer) * Sqrt 1-v^2/c^2] will this then...

That is part of the problem the question does not give the speed of the rocket. I did originally think that it may be simply the actual distance of 5 ly against the 6years observed time, ie 5/6 = 0.83c but regarded that as too obvious!

1. Homework Statement [/b] Just need some help getting started on what looks like a rather simple problem! A rocket travels to a star 5 light years distant, observers on the star time the journey at 6years. I need to find the time recorded on a clock aboard the rocket and the distance to the...