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. 👍
  2. 👎
  3. 👁

Respond to this Question

First Name

Your Response

Similar Questions

  1. science help

    What is true about valence electrons? They are those electrons that are closest to the nucleus They are those electrons that are neutrally charged They are those electrons that are found in the nucleus They are those electrons

  2. Chemistry

    It takes 254 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoelectric effect? I'd appreciate it

  3. biology

    Sulfur has six electrons in its outer most energy level. In ionic bonding, it would tend to ­­­­­­­­­_____________________________. A. take on two more electrons B. give away two electrons C. give away six electrons D.

  4. 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?

  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?

  2. chemistry

    Which of the answers choices best describes John Dalton's contribution to atomic theory? he discovered to nucleus he gave future scientist a foundation for understanding how electrons move. he gave future scientist a foundation

  3. Chemistry

    The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ν0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.48 × 1014 s–1. With

  4. Chemistry

    Which statement concerning the electrons surrounding the nucleus of an atom is NOT correct? a) When 2 electrons pair together, they have opposite spins. b) The number of the electrons in an isolated neural atom is equal to the

  1. chem

    Why is it expected that 2/10 of the ejected electrons will cone from the n=1 shell, and 8/10 ofthe electron from the n=2 shell?

  2. Physics

    In a cathode ray tube, a beam of electrons is injected horizontally into the exact center of the parallel-plate region. Here L = 3.0 cm and d = 0.20 cm. The top plate has a surface charge density of σ0 = +0.15 μC / m2, and the

  3. 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?

  4. physics

    The greater the work function for a metal, A) the greater the speed of the ejected electron B) the smaller the speed of the ejected electron C) the more electrons are ejected D) the lower the threshold frequency E) none of the

You can view more similar questions or ask a new question.