1. Not finding help here? Sign up for a free 30min 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!

Help with light, wavelength, and photons

  1. Oct 21, 2005 #1
    I need help with parts of this question.
    6. The red light emitted from a Helium-Neon LASER has an energy of 3.15 x 10^-19 J.
    a. At what speed do "red photons travel? I need help with this one.

    B. calculate the wavelength of these photons.
    I got 6.31424 x 10^-7m. Is this correct.

    c. comment on the speeds of the photons from the LASER versus the X-ray photons. I need help with this one.

    I am trying to study for a quiz and really need help.

    Thanks.
     
  2. jcsd
  3. Oct 22, 2005 #2

    Ouabache

    User Avatar
    Science Advisor
    Homework Helper

    If you show us what you have tried so far (work) and where you are getting stuck, we can point you in a successful direction.
     
  4. Oct 22, 2005 #3
    I don't know how to do a and c, but I got the answer to b. IS b correct?
    and can you help with a and c. Thanks
     
  5. Oct 23, 2005 #4

    Gokul43201

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    We can't tell you if (b) is correct, unless you show how you got that number.

    As for (a) and (c), you have to show some effort. What are your thoughts ?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?