Physics

Electrons are ejected from a surface with speeds ranging up to 6.0 x 10^5 m/s when light with a wavelength of 400 nm shines on it.

a.) What is the work function of this surface?

b.) What is the threshold frequency for this surface?

c.) What is the deBroglie wavelength of an electrion traveling at its maximum velocity?


Please do not just retype quesations and ask us to do them for you. Read your assignment and look for the equation describing the photoelectric effect. The work function is the greek leter "phi" . The kinetic energy of the emitted charge is given by
E = h* f - e * phi

h is Planck's constant and f is the frequency and e is in this case the charge of an electron.

(b) The threshold frequency is the minimum that it takes to get any emission of electrons as all. Get it by setting E = 0 in the equation above and solving for f.

(c) Familiarize your self with the relationship between velocity and De Broglie wavelength of a particle:
(wavelength) = h/(velocity)
For the velocity, use 6.0 x 10^5 m/s


Im not retyping the wuestios hoping for someone to do them for me. I'm not suppose to be in this class and I've been lost all year. Now its time to study for my final and I need to do good, so Im hoping that you or anyone else can give me the equatoin to use and point me in the right direction.


<<I'm hoping that you or anyone else can give me the equation to use and point me in the right direction.>>

If you are not supposed to be in the class, why are you taking it? You will learn much more from the class if you make an effort to at least find the correct equation. I will be happy to critique your work when I see some evidence of it.

  1. 👍 0
  2. 👎 0
  3. 👁 155
asked by Nathaniel

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    Electrons are ejected from a metallic surface with speeds ranging up to 4.50x10^5 m/s when light with a wavelength of 615nm is used. (a) What is the work function of the metal? (b) What is the cutoff frequency for this surface?

    asked by genius on May 2, 2012

  2. chemistry

    Light with a wavelength of 405 nm fell on a strontium surface, and electrons were ejected. If the speed of an ejected electron is 3.49 105 m/s, what energy was expended in removing the electron from the metal? Express the answer

    asked by Emily on November 7, 2010

  3. Chemistry

    A photoelectric experiment is performed by separately shining a laser of 450 nm (blue light) and 560 nm (yellow light) on a metal surface and measuring the number and kinetic energy of the ejected electrons. The threshold

    asked by Nora on April 15, 2015

  4. Chemistry

    A photoelectric experiment is performed by separately shining a laser of 450 nm (blue light) and 560 nm (yellow light) on a metal surface and measuring the number and kinetic energy of the ejected electrons. The threshold

    asked by Nora on April 15, 2015

  5. chemistry

    Light with a wavelength of 405 nm fell on a strontium surface, and electrons were ejected. If the speed of an ejected electron is 3.39 105 m/s, what energy was expended in removing the electron from the metal?

    asked by Anonymous on November 12, 2010

  6. physics

    In the photoelectric effect, does brightness or frequency determine the Kinetic energy of the ejected electrons? Which determines the number of the ejected electrons?

    asked by coach on December 5, 2009

  7. chemistry

    An experiment is set up in which a copper surface is irradiated with high-intensity photons with a wavelength of 15.0nm. Electrons ejected from the surface are found to have a velocity of .548% of c. What is the binding energy of

    asked by Anonymous on June 28, 2012

  8. Chemistry

    electrons are ejected when a metal is irradiated with 570 nm light. if the wavelength of the ejected electrons is 1.0 nm, what is the work function of the metal? The answer is 1.08 X 10^-19 J, but I dont know how to get here

    asked by Joshua on December 7, 2016

  9. physics

    what effect did scientists originally think that the intensity of light shining on a photosensitive surface would have on electrons ejected from that surface?

    asked by aaa on April 11, 2012

  10. Physics

    a) If the work function for a certain metal is 1.8 eV, What is the stopping potential for electrons ejected from the metal when light of wavelength 400 nm shines on the metal? b) What is the maximum speed of the ejected electrons?

    asked by Vanda on March 20, 2011

More Similar Questions