When light of wavelength \( 248 \mathrm{~nm} \) falls on a metal of threshold energy \( 3.0 \mathrm{~eV} \), the de-Brog…

When light of wavelength \( 248 \mathrm{~nm} \) falls on a metal of threshold energy \( 3.0 \mathrm{~eV} \), the de-Broglie wavelength of emitted electrons is ....... Å.

[Use: \( \sqrt{3}=1.73, \mathrm{~h}=6.63 \times 10^{-34} \mathrm{Js}, \mathrm{m}_{\mathrm{e}}=9.1 \times 10^{-31} \mathrm{~kg} \); \( \left.\mathrm{c}=3.0 \times 10^{8} \mathrm{~ms}^{-1} ; 1 \mathrm{eV}=1.6 \times 10^{-19} \mathrm{~J}\right] \)

[JEE Main 2021, 16 Mar (Shift 1)]