Answer:
435 nm
Explanation:
Given the energy required to dislodge electrons from sodium metal via the photoelectric effect is 275 kJ/mol
⇒ energy per photon =energy per mole/Avogadros number
=[tex]\frac{275\times1000}{6.022\times10^{23}}[/tex]
= 4.5666 x 10^(-19) J
[tex]Wavelength=\frac{hc}{energy per photon}[/tex]
=[tex]\frac{6.626\times10^{-34}\times3\times10^8}{4.56\times10^{-19}}[/tex]
=[tex]4.35\times10^{-7} m[/tex]
=435 nm
hence the wavelength is equal to 435 nm
