1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Force of Electromagnetic Radiation and Visible Light

  1. Nov 10, 2012 #1
    Is there an equation for force due to electromagnetic radiation?

    For example, is there a force due to orange light?
     
  2. jcsd
  3. Nov 10, 2012 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    welcome to PF;
    yes: F=dp/dt

    Photons carry momentum so you can use conservation of momentum and the brightness of the light to figure the force. Generally, light illuminates an area so you will be working out force per unit area.
    - look up "light pressure"
     
  4. Nov 12, 2012 #3

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Light can also carry angular momentum; additionally, linearly polarized light can exert a torque on a birefringent material.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook