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!

Please Help me I'm student.

  1. Jun 16, 2011 #1
    Please!!! Help me.. I'm student.

    1. The problem statement, all variables and given/known data
    1. A light ray reflected from a flat mirror moves through an angle of 143* as the mirror is rotated. Through **what angle was the mirror rotated?

    2. The speed of light in a material is 0,57c. what is the critical angle of a light ray at the interface between the material and a vacuum?

    3.The electric field of plane electro magnetic wave is E=240V/m. At the same instant of time the magnetic field is....?
     
  2. jcsd
  3. Jun 16, 2011 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    welcome to pf!

    hi namvip6666! welcome to pf! :wink:

    show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
  4. Jun 16, 2011 #3
    Re: welcome to pf!

    Can you solve for me all of them. I don't kno*w how to do it.
     
  5. Jun 16, 2011 #4

    phinds

    User Avatar
    Gold Member
    2016 Award

    Re: welcome to pf!

    That's not how this forum works. Read the forum rules and post the problem in the proper format, as tiny-tim said to. Once you've shown what you DO understand and what you DON'T understand, then we can help with what you don't understand.

    We're NOT here to solve your problems, we're here to help you learn how to THINK about your problem so you can solve it yourself.
     
  6. Jun 16, 2011 #5
    Re: welcome to pf!

    So, can you tell me the formular to calculate it?
     
  7. Jun 16, 2011 #6

    phinds

    User Avatar
    Gold Member
    2016 Award

    Re: welcome to pf!

    Read the forum rules and post the problem in the proper format as I said in the first place
     
  8. Jun 16, 2011 #7

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    no, namvip6666, if you're going to learn, you tell us the formulas

    1 is about reflection of light, 2 is about refraction of light, 3 is about E and B of a plane wave …

    tell us what equations you know about these three situations …

    if you don't know any, go back to your lecture notes or your book, and find some :smile:
    so study! :wink:
     
  9. Jun 16, 2011 #8
    Re: Please!!! Help me.. I'm student.

    Namvip6666, if you seek help here on the physics forums in your homework, you need to show some of your attempts at the solution. If you just come here and plead that "i am a student, please help", "Please give me the solution to it" no one is gonna help you. Moreover you should first check the rules before asking help in Homework section.

     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Please Help me I'm student.
  1. Please help I'm stuck (Replies: 11)

Loading...