Physics

5 July, 18:57

Radiation with a wavelength of 238 nm shines on a metal surface and ejects electrons that have a maximum speedof 3.75 X 105 m/s.

Which one of the followingmetal is it, the calues in paretheses being the work functions:

a) potassium (2.24 eV)

b) calciun (2.71 eV)

c) uranium (3.63 eV)

d) aluminium (4.08 eV)

e) gold (4.82 eV)

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