chemistry

posted by .

A laser pulse with wavelength 540 nm contains 4.40 Mj of energy. How many photons are in the laser pulse?

  • chemistry -

    E = hc/wavelength. Substitute and solve for E = energy of one photon. Then,
    E of 1 photon x #photons = 4.40E6 J.
    Solve for # photons.

  • chemistry -

    1.198

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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 fall …
  2. ap chem

    How do you set this problem up? A laser emits at a wavelength 987 nm. all of its output energy is absorbed in a detector that measures a total energy of .52 joules over a period of 52 seconds. how many photons per second are being
  3. Physics

    A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20 ms in duration. THe average power expended during each pulse is .600 W. (a) How much energy is in each pulse, in joules and electron …
  4. chem

    A laser pulse with wavelength 540 nm contains 4.40 Mj of energy. How many photons are in the laser pulse?
  5. 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).
  6. Physics Question

    Pulsed lasers used in science and medicine produce very short bursts of electromagnetic energy. If the laser light wavelength is 1062 nm (this corresponds to a Neodymium-YAG laser), and the pulse lasts for 40 picoseconds, and 1.1 x …
  7. chemistry

    How many photons are produced in a laser pulse of 0.324 J at 631 nm?
  8. Physics !:(

    A carbon dioxide laser is an infrared laser. A CO laser with a cavity length of 48.6cm oscillates in the m=100,000.0 mode. What is the wavelength of the laser beam?
  9. 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?
  10. physics

    a ruby laser emits light at wavelength 694.4nm. if a laser pulse is emitted for 12pico seconds and the energy released per pulse is 100mJ, what is the length of the pulse?

More Similar Questions