Hey! Sign in to get help with your study questionsNew here? Join for free to post

What am I doing wrong? photolelectric effect

Announcements Posted on
Win top prizes...including a cool £10k. Check TSR's competition page 19-05-2016
  1. Offline

    Metal surface is illuminated with light of wavelength 410nm, photoelectrons are emitted with a maximum kinetic energy of 2.1x10-19 joules.

    Calculate the work function of the metal surface.

    Energy of the photon = C/lambda = F
    = 3x10^8 / 410x10-9 = 7.317x10^14 HZ
    energy of photon = HF = 6.63x10-34 * 7.312x10^14 = 4.85x10^-19 joules.

    To work out work function

    HF = workfunction + max KE
    workfunction = HF - max KE
    = 4.85x10-19 - 2.1x10-19 = 2.75x10-19 joules.

    This is wrong? the answer is supposed to be 1.61x10-19 joules so I don't know what I have done wrong, can anyone help?

  2. Offline

    As far as I can see, your answer is correct.
  3. Offline

    Looks right to me too. Are you doing a book question?
  4. Offline

    (Original post by Hazza616)
    Looks right to me too. Are you doing a book question?
    Yep, its the turning points AQA book


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: June 15, 2012
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.

Today on TSR

Edexcel GCSE maths answers

Check the unofficial mark scheme

What date is the EU referendum on?
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.