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!

Homework Help: Different frequency units?

  1. Dec 3, 2005 #1
    for the frequency of revolution of electrons, the unit is expressed as rev/s
    but for the frequency of a photon, the unit is hz

    my question:
    can rev/s also equal hz?
  2. jcsd
  3. Dec 3, 2005 #2


    User Avatar
    Gold Member

    Well frequency is really just s^-1

    Saying the "frequency of revolution" however qualifies the "rev/s" because you have frequency... "/s"... and revolutions "rev".
  4. Dec 3, 2005 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Yes it can. 1 rev/sec is equal to 2pi rad/sec. This is angular frequency. If you look in elementary texts on circular motion, there's a directly relationship between angular frequency and the "usual" frequency.

  5. Dec 3, 2005 #4
    so if i see frequency, i can just use hertz, right?
  6. Dec 3, 2005 #5


    User Avatar
    Science Advisor

    You will also see cycles/sec a lot of times for units of frequency.
  7. Dec 3, 2005 #6


    User Avatar
    Homework Helper

    Hz is any COUNT per second ... your computer uses Mega "pulses per second", because its clock oscillates with a lot of "oscillations per second" , and the microwave oven produces even more "waves per second".
  8. Dec 4, 2005 #7
    thank you very much!!!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook