Radiation from the transition from n9 to n6 fo be shines on, Physics

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Radiation from the transition from n9 to n6 fo be shines on

Here is the problem which I am struggling on, please help me!

Problem: Radiation from the transition from n=9 to n=6 fo BE+++ shines on a metal surface and ejects electrons. From which of the following metals will electrons be ejected? : potassium (2.240 eV), calcium (2.710 eV), uranium (3.630 eV), aluminum (4.080 eV, gold (4.820 eV, the values in parenthesis are the work functions.

A- Find the greatest possible speed of the electrons ejected.

Rework your solution from the beginning and check each step carefully.

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