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

    16
    ReputationRep:
    Hi, I have a graph here of the photoelectric effect, the y intercept is the work function, but what I don't understand is how can the work function be negative? That would mean the material needs negative energy which isn't possible for the photoelectric effect to occur?
    Offline

    16
    ReputationRep:
    (Original post by ᒍack)
    Hi, I have a graph here of the photoelectric effect, the y intercept is the work function, but what I don't understand is how can the work function be negative? That would mean the material needs negative energy which isn't possible for the photoelectric effect to occur?
    from the y-intercept to the point where y=0 that is the energy of the work function, look at the x-axis. It's not negative energy, it's energy that needs to be gained.
    • Thread Starter
    Offline

    16
    ReputationRep:
    (Original post by Mikasadoge)
    from the y-intercept to the point where y=0 that is the energy of the work function, look at the x-axis. It's not negative energy, it's energy that needs to be gained.
    Ah ok, It's just i had Ekmax = hf - work function so when i'm plotting it, the work function is in the negatives on the graph.
    So from what you're saying the work function is actually the difference between 0 on the y axis and the point at which it intercept? and that it will always be positive?
    Offline

    16
    ReputationRep:
    (Original post by ᒍack)
    Ah ok, It's just i had Ekmax = hf - work function so when i'm plotting it, the work function is in the negatives on the graph.
    So from what you're saying the work function is actually the difference between 0 on the y axis and the point at which it intercept? and that it will always be positive?
    yeah if I'm imagining the same graph as you. Hope it made sense
    • Thread Starter
    Offline

    16
    ReputationRep:
    (Original post by Mikasadoge)
    yeah if I'm imagining the same graph as you. Hope it made sense
    This is a google image of a the same graph, and yes it did thanks, it confused me a little, just clicked in my head then

    https://www.google.co.uk/search?q=ph...5XyOYAlNCcorM:
    Offline

    16
    ReputationRep:
    (Original post by ᒍack)
    This is a google image of a the same graph, and yes it did thanks, it confused me a little, just clicked in my head then

    https://www.google.co.uk/search?q=ph...5XyOYAlNCcorM:
    yep looks good to me, you're welcome
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: October 31, 2017
Poll
“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...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.