Recent content by wyse

hi bob, thanks for the reply. so the proton size is 1x10^{-15} , and so this helps me with (ii). sorry i haven't done any relativity so i don't have a clue what it is on about (i'm a maths student doing a physics course). which formulae? thanks

hey guys, here's the question. [SIZE="2"]Physicts probe inside neutrons and protons by scattering electrons off them. (i) Explain briefly why it is important that the electrons have high energy. (ii) Assuming that the protons and neutrons were at rest, calculate the minimum momentum to which...

thanks for the reply. (i) so since luminosity is related to absolute magnitude, we have \frac{L_{sun}}{L_{bulb}} = \frac{M_{sun}}{M_{bulb} } so we have \frac{3.8 e 10^{30}}{80}= \frac{4.75}{M_bulb} which we reaarange to get 7.5 e 10^{-29} (ii) so we need to use the forumla m - M =...

hi guys, (i) By comparing with the luminosity of the Sun, calculate the absolute magnitude of a 60W light bulb. [The absolute magnitude of the Sun is +4:75; you may ignore colour differences between the bulb and the Sun.] (ii) The Hubble Space Telescope (HST) can detect objects as faint...

thanks for the replies, i don't know where i got the negative from. cheers!

here's the question: 'Darwin is a proposed space mission to detect thermal radiation from Earth-like planets. Estimate the best wavelength for carrying out observations with Darwin.' i'm guessing we need to use wien's law(from an earlier part of the question), and so we need the absolute...