physics

A laser emits 1.44*10^18 photons per second in a beam of light that has a diameter of 1.98 mm and a wavelength of 524.5 nm.
(a) Determine the average electric field strength
(b) Determine the average magnetic field strength for the electromagnetic wave that constitutes the beam.

  1. 👍 0
  2. 👎 0
  3. 👁 73
asked by rick
  1. You know the energy (given wavelenght and the number of photons)

    http://en.wikipedia.org/wiki/Poynting_vector

    You know the Poynting vector (watts/m^2) in the beam, so figure E and B.
    check my thinking.

  2. still don't understand where does wavelength and number of photons go too? do you divdide them to get energy or what?

    1. 👍 0
    2. 👎 0
    posted by rick
  3. You get energy per photon from Planck's equation, then multiply by the nubmer to get joules/second (watts).

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A laser emits 1.42 1018 photons per second in a beam of light that has a diameter of 1.82 mm and a wavelength of 524.0 nm. Determine each of the following for the electromagnetic wave that constitutes the beam. (a) the average

    asked by Anonymous on April 17, 2014
  2. Chemistry

    A laser produces 15.0mW of light. In 3.00hr , the laser emits 4.53×1020 photons. What is the wavelength of the laser?

    asked by Anonymous on September 15, 2014
  3. chemistry

    An argon ion laser puts 5 W of continuous power at a wavelength of 532 nm. the diameter of the laser beam is 5.5 nm. if the laser is pointed at an object, how many photons of laser will strike the object per second.|(1W=1Js-1).

    asked by osa on November 11, 2009
  4. physics... PLEASE HELP

    A typical laser used in introductory physics laboratories produces a continuous beam of light about 1.0 mm in diameter. The average power of such a laser is 0.75 mW. (i) What is the average intensity? (ii) What is the peak

    asked by maranda on October 15, 2014
  5. Physics

    A helium-neon laser emits light of wavelength 633 nanometers(nm). Light from an argon laser has a wavelength of 515 nm. Which laser emits the higher-frequency light?

    asked by Shirley on February 22, 2008
  6. physics

    A student holds a laser that emits light of wavelength 641.5 nm. The laser beam passes though a pair of slits separated by 0.400 mm, in a glass plate attached to the front of the laser. The beam then falls perpendicularly on a

    asked by James urgent on March 21, 2016
  7. Science ENGR

    Consider a laser which emits photons with a wavelength of 1.55 micrometers. The laser has a lower electron level Ei and an upper electron level Eu. A power supply pours electrons into the upper energy level and these electrons

    asked by Pam on November 19, 2006
  8. physics

    I=0.5E0EO²C where E0 is the permitivity of the vacuum and C is the velocity of light. a)Show that the units of the equetion are consistant b)A certain helium-neon laser emits 0.20mW in a beam of cross sectional area

    asked by nnanga on September 15, 2013
  9. Physics

    A laser source emits lights of wavelength 62100m and has an output of 35mW calculate how many photons are emitted per minute by this laser sourse

    asked by Uuu on November 2, 2014
  10. Physics

    A carbon dioxide laser is an infrared laser. A CO2 laser with a cavity length of 48.4 cm oscillates in the m=100,000.0 mode. 1. What is the wavelength of the laser beam? 2. What is the frequency of the laser beam?

    asked by Mike on November 25, 2010

More Similar Questions