How to find work function of an element when threshold energy, wavelength is given?
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threshold energy=0.24 eV element = Cu wavelenght= 250nm
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Answer:
the energy of a 250nm radiation is E=hc/Wavelength =6.626*10^-34*3*10^8/250*10^-9=7.95*10^-... 1eV =1.6*10^-19j J so 7.95*10^-19/1.6*10^-19=4.97 eV so as you need 0.24 eV to extract your electron , the remainder is work 4.97-0.24=4.73 eV
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