Question

The work function of iron metal is 4.50 eV. What is the maximum speed of the photoelectrons ejected from iron, when light with a wavelength of 142 nm is shined on its surface?

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Answer 1

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we know, hc 0+ KE max 18; work function) 2 - KE = eV = ha -- 1240 ev nm 142 nm 4.50 eu » KE = ev 8073 4050 eu - 4.23 I mot 4023x16x10-16 2x 4.23 x 16 xio-ra 9.1 x 10-31 28 (9 1,487,472,527,47205 7) Oman = 1,219,619.83 m/s. ?? 10.22x106 wils. CS Scanned with CamScanner

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