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

    9
    ReputationRep:
    I was solving a past paper Young's Double Slit Experiment question and a part of it asked that what will happen to fringe separation and brightness when the wavelength of light is increase. I understand that fringe separation, x, will increase as x=\frac{\lambda D}{a}. As about brightness, I think that it will remain unchanged, but the mark scheme says that it will be affected. I don't remember whether it said increase/decrease. Please explain.
    Offline

    0
    ReputationRep:


    As wavelength increases, the light from the same slit (of same intensity) is spread over a wider region. Therefore, decreasing brightness.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.