work function of copper is 4.4ev does copper undergo photoelectric emission by light of wavelength by 6800
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The complete question is:
Work function of copper is 4.4 eV. Does copper undergo photoelectric emission by light of wavelength 6800 A°.
Given:
Work function of copper = 4.4 eV
Wavelength of light used = 6800 A (units are not mentioned of the wavelength used therefore I used Angstrom)
To find:
Will copper undergo photoelectric emission or not.
Solution:
The energy of incident photon will be:
E = hc/ λ
= 6.63*10⁻³⁴*3*10⁸/ 6800*10⁻¹⁰
= 2.925*10⁻¹⁹ J
Which will be 1.826 eV
Since the energy of the incident photon is less than the work function of copper therefore there copper will not undergo any photoelectric emission.
Thus copper will not undergo photoelectric emission.
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