Let\'s apply eV_0 = hf - phi to a specific photoelectric-effect experiment. In t

Question

Let's apply eV_0 = hf - phi to a specific photoelectric-effect experiment. In the experiment, a reverse potential difference of 1.25 V is required to reduce the current of omitted electrons to zero. Using this value, together with the mass and change of the electron, find the maximum kinetic energy and the maximum speed of the photoelections emitted. What reverse potential is required to reduce the current to zero if the maximum electron speed Express your answer to three significant to three significant figures and include appropriate units.

Explanation / Answer

The value of speed in your question is not much readable. I assume it to be 1.05 * 10^4 m/s

v= (2KE/m)^1/2

1.05 * 10^4 = [2*(Vstop)/(9.1*10^-31)]^1/2

or Vstop = 5.01638×10^-23

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