1. Tardigrade
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  4. Electrons make transition from n = 2 to n = 1 in a sample of excited hydrogen atom. Emitted photons strike on a metal of work function (φ)=4.2eV. What is the value of maximum kinetic energy of ejected electron in process?

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Q. Electrons make transition from n = 2 to n = 1 in a sample of excited hydrogen atom. Emitted photons strike on a metal of work function $\left(\phi\right)=4.2eV.$ What is the value of maximum kinetic energy of ejected electron in process?

NTA AbhyasNTA Abhyas 2022

Solution:

$E_{in}=10.2 \, eV$
$\phi=4.2 \, eV$
$KE_{max}=10.2-4.2=6eV$
The maximum kinetic energy in this case will be "6 eV".