The work function for a particular metal is 4.0 eV. Which oneof the following be

Question

The work function for a particular metal is 4.0 eV. Which oneof the following best describes the wavelength of electromagneticradiation needed to eject electrons from this metal?

a. 620 nm or smaller
b. 310 nm or smaller
c. 310 nm or greater
d. 620 nm or greater
e. 800 nm or greater The work function for a particular metal is 4.0 eV. Which oneof the following best describes the wavelength of electromagneticradiation needed to eject electrons from this metal? 620 nm or smaller 310 nm or smaller 310 nm or greater 620 nm or greater 800 nm or greater

Explanation / Answer

Threshold wavelength ( wavelength below which photoelectronsare ejected) is given by    0   =   h* c /       =   workfunction of incident photon inJoule   =   4.0 * 1.6 *10-19   =   6.4 *10-19   J    =>   0   =   6.62* 10-34 * 3 * 108 / 6.4 *10-19   =   3.1031 *10-7   m   =   310.31   nm       b. 310 nm orsmaller 310 nm orsmaller

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