Recent content by rano jojo

really ? how? what is the difference please

thank you, this is what i meant multiplying itself by the power of three and not multiplying the number by 3. so is this correct or not?

Thank you, but i how i can get the frequency and then how i can find the number of the photons? just i am confused

many thanks but i don't have the book

i know that the total energy density of a blackbody radiation is E= 4 segma/C * T^4 so how i can use this to find the number of the CMB photons in 0.25 litre?

many thanks , but what i believe that i will find the ration then multibly it by 3 times as the universe id 3 dimension and that would be the ratio!

many thanks for your kindhelp but i tried to convert it but couldn't work , as i am still new to the studies of cosmology . would you elaborate more to help me out please? thank you again

many thanks but i still cannot get it. i thought of solving for the R = 1/1+z of both galaxies and substract the two values to reach the the volume increase between the two epochs.

Hey ! i am having this question to be answered , i am new to the cosmology studies and still a bit confused about some formulas. the question is: (a) The greatest redshift known corresponds to the cosmic microwave background (CMB, CBR) at redshift z 1100 (although the redshift is obtained...