Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
    • Thread Starter

    What is the energy (in KJmol^-1) of X-ray photons with a wavelength of 100pm?

    I tried to use E=hv and c-v*wavelength and rearrange but i dont get the right answer

    Correct answer:1.20 x10^6

    I'm using w for wavelength here, since there is no lambda!

    If v=fw and v=c,
    c=fw, and f= c/w
    Then you should be able to use E=hf and get the energy.
    I'm not sure why there's the kJ/mol there though - maybe that's something to do with the context of the question.
    That's how I'd work it out anyway, good luck!
Submit reply
Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Updated: December 17, 2017
“Yanny” or “Laurel”

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.