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a photocell cathode is made of a metal with a work function of 2.8eV?

a) light of a wavelength 400nm shines on the cathode. Will photoelectrons be emitted?

2007-09-24 08:28:16 · 1 answers · asked by nothingspecial 1 in Science & Mathematics ➔ Physics

1 answers

hc/wl >= W

2.8 eV < hc/wl = 6.62*10^-34*3*10^8/400*10^-9/1.6*10^-19 = 3.103 eV Yes an electron will be emitted.

2007-09-24 08:41:40 · answer #1 · answered by nyphdinmd 7 · 0⤊ 0⤋

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