(C) The work function $\Phi = 4.2 \, eV = 4.2 \times 1.602 \times 10^{-19} \, J \approx 6.73 \times 10^{-19} \, J$. The energy of the incident radiati

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(C) The work function $\Phi = 4.2 \, eV = 4.2 \times 1.602 \times 10^{-19} \, J \approx 6.73 \times 10^{-19} \, J$. The energy of the incident radiation $E = \frac{hc}{\lambda} = \frac{6.626 \times 10^{-34} \times 3 \times 10^8}{2000 \times 10^{-10}} \, J = 9.939 \times 10^{-19} \, J$. According to Einstein's photoelectric equation,$K_{max} = E - \Phi$. $K_{max} = (9.939 - 6.73) \times 10^{-19} \, J = 3.209 \times 10^{-19} \, J$. Thus,the kinetic energy is approximately $3.2 \times 10^{-19} \, J$.

Class 11 Chemistry Structure of Atom Atomic models and Planck's quantum theory

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The work function of a metal is $4.2 \, eV$. If radiation of $2000 \, \mathring{A}$ falls on the metal,then the kinetic energy of the fastest photoelectron is:

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A
$1.6 \times 10^{-19} \, J$
B
$16 \times 10^{-10} \, J$
C
$3.2 \times 10^{-19} \, J$
D
$6.4 \times 10^{-10} \, J$

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The work function of a metal is $4.2 \, eV$. If radiation of $2000 \, \mathring{A}$ falls on the metal,then the kinetic energy of the fastest photoelectron is:

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