The difference between threshold wavelengths for two metal surfaces \(A\) and \(B\) having work function \(\phi_A=9 eV\) and \(\phi_B=4.5 eV\) in \(nm\) is:
(Given, hc \(=1242 eV nm ) \quad\)

[JEE Main 2023, 13 Apr (Shift I)]

Question

The difference between threshold wavelengths for two metal surfaces \(A\) and \(B\) having work function \(\phi_A=9 eV\) and \(\phi_B=4.5 eV\) in \(nm\) is:
(Given, hc \(=1242 eV nm ) \quad\)

[JEE Main 2023, 13 Apr (Shift I)]

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