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Math Help - science question!

  1. #1
    Junior Member
    Joined
    Jan 2009
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    57

    science question!

    a) The activation energy needed to convert cis-retinal to trans-retinal is 4 × 10–19 J. What is the reaction rate for one molecule at body temperature (310 K)? In the absence of light, how long would you have to wait for a reaction to take place?

    b) What wavelength of light is required to convert cis-retinal to trans-retinal? If the molecule were exposed to a blackbody at 310 K, should we expect a lot of photons with this wavelength?

    Any idea how to start these?

    Thanks
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  2. #2
    MHF Contributor Unknown008's Avatar
    Joined
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    I guess that you know about the Arrhenius equation which I just came to know using google... which is:

    k = Ae^{-E_a/RT}

    But apart from the first part in part (b), I don't know how to tackle the problem.

    For (b) use E = \dfrac{hc}{\lambda}

    E = 4\times 10^{-19} J

    h = 6.63 \times 10 ^{-34}Js

    c = 3.0\times 10^8 ms^{-1}

    Lambda is what you are looking for.
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