Question

Work function for sodium metal is 1.82ev, calculate the threshold frequency for sodium?

Answer 1

Answer:

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Yes

Answer 2

The threshold frequency for sodium is $4.39\times 10^{14}s^{-1}$

Explanation:

To calculate the threshold frequency for a given work function, we use the equation:

$\phi =h\nu_o$

where,

$\phi$ = work function of the sodium metal = $1.82eV=2.912\times 10^{-19}J$     (Conversion factor:  $1eV=1.6\times 10^{-19}$ )

h = Planck's constant = $6.62\times 10^{-34}Js$

$\nu_o$ = threshold frequency = ?

Putting values in above equation:

$2.912\times 10^{-19}J=6.62\times 10^{-34}Js\times \nu_o\\\\\nu_o=\frac{2.912\times 10^{-19}J}{6.62\times 10^{-34}Js}=4.39\times 10^{14}s^{-1}$

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