what stopping potential will stop electrons of energy 5.3x10^-19 J?

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1) If light is shone on an anode, a current will be producedcontaining electrons with a particular maximum kinetic energy.Placing a potential across the metal such that it opposes thecurrent will slow the electrons. You illuminate a cesium surfacewith light with wavelength 5230 Ã and measure a stopping potentialV0 of 0.23 V, and then change the wavelength to 4080 Ã and measurea V0 of 0.90 V.

a. What is the frequency of the 5230 Ã wavelength lightsource?

b. What is the frequency of the 4080 Ã wavelength lightsource?

c. For the electrons with 0.23V stopping potential, find themaximum kinetic energy the electrons will have when they areejected from the anode.

d. For the electrons with 0.90V stopping potential, find themaximum kinetic energy the electrons will have when they areejected from the anode.

e. Find an experimental value of Planckâs constant.

f. What is the work function of the anode?

(a) Find the electric potential difference ΔVe required to stop an electron (called a "stopping potential") moving with an initial speed of 2.43x10^7 m/s.

(b) Would a proton traveling at the same speed require a greater or lesser magnitude of electric potential difference? Explain.

(c). Find an expression for the ratio of the proton stopping potential and the electron stopping potential.