Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    I have a few really difficult questions to answer and dont know where to start on a few of them, any help would be aprreciated!


    When radiation of wavelength l is incident on a metallic surface, the stopping potential is 4.8 volts.
    If the same surface is illuminated with radiation of double the wavelength, then the stopping
    potential becomes 1.6 volts. What is the threshold wavelength for the surface?

    (are threshold and cut off wavelengths the same thing?)



    The transmission probability (PT) describes the likelihood of an incident particle, of given
    energy, passing through a rectangular barrier of width L. For a particular system, PT = 1x103.
    What will be the value of PT when we double the width of the barrier?


    Thank you!
    Offline

    2
    ReputationRep:
    work function of the surface with threshold frequency (f0) or threshold wavelength
    work function = hf0 = hc/wavelength >>>>rearrange this
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

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.