Light of wavelength 4000 mathringA is incident on a sodium surface for which the threshold wavelength of photoelectrons is 5420 mathringA. The work function of sodium is:

Question

Light of wavelength 4000 mathringA is incident on a sodium surface for which the threshold wavelength of photoelectrons is 5420 mathringA. The work function of sodium is: (A) 4.58 eV (B) 2.29 eV (C) 1.17 eV (D) 0.57 eV

Tardigrade Admin · Accepted Answer

φ=( hc /λ0) =(12400/5420) eV =2.28 eV

Q. Light of wavelength $4000 \overset{˚}{A}$ is incident on a sodium surface for which the threshold wavelength of photoelectrons is $5420 \overset{˚}{A}$ . The work function of sodium is:

4.58 eV

2.29 eV

1.17 eV

0.57 eV

$ϕ = \frac{h c}{λ _{0}}$
$= \frac{12400}{5420} e V = 2.28 e V$

Q. Light of wavelength 4000A˚ is incident on a sodium surface for which the threshold wavelength of photoelectrons is 5420A˚. The work function of sodium is: