Question

If the threshold wavelength for photoelectric effect on sodium metal is 5000A0

then find its

work function.

Answer 1

Answer is 2.475eV. hope that helps you.

Answer 2

Answer:

Work function, W = 2.48 eV

Explanation:

Given that,

Threshold wavelength for the photoelectric effect on sodium metal is, $\lambda=5000\ A=5\times 10^{-7}\ m$

Let W is the work function of the sodium metal. The formula used to find the work function is given by :

$W=\dfrac{hc}{\lambda}$

$W=\dfrac{6.63\times 10^{-34}\times 3\times 10^8}{5\times 10^{-7}}$

$W=3.97\times 10^{-19}\ J$

Since, $1\ eV=1.6\times 10^{-19}\ J$

W = 2.48 eV

So, the work function of the sodium metal is 2.48 eV. Hence, this is the required solution.