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When light of wavelength, 288 nm, impinges a photocathode it ejects electrons at a
speed of 4.75 x 105 m/s. What is the binding energy (in eV) of this photocathode?
h = 6.626 x 10-34 J-s, c= 2.9979 × 108 m/s, 1 eV = 1.602 x 10-19 J, NA = 6.022 ×
1023 mol ¹, and me = 9.109 x 10-31 kg. Report your answer to THREE significant
figures.
Sagot :
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