Speed of light:

$\overline{){\mathbf{c}}{\mathbf{=}}{\mathbf{f}}{\mathbf{\lambda}}}$

The energy of electromagnetic radiation:

$\overline{){\mathbf{E}}{\mathbf{=}}{\mathbf{h}}{\mathbf{f}}}$

h is plank's constant.

**(A)**

f = c/λ = (3.0 × 10^{8})/(272 × 10^{-9}) = 1.10 × 10^{15} hz

The photoelectric threshold wavelength of a tungsten surface is 272 nm .

Part A

What is the threshold frequency of this tungsten?

Part B

What is the work function (in eV ) of this tungsten?

Part C

Calculate the maximum kinetic energy (in eV ) of the electrons ejected from this tungsten surface by ultraviolet radiation of frequency 1.48×10^{15} Hz.

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