Question

Work function of a metal surface is 4.2ev the maximum wavelength which can eject electrons from this metal surface is

Answer 1

The maximum wavelength which can eject electrons from this metal surface is $2946A^{0}$

Explanation:

The work function is the minimum energy required to remove an electron from the surface of the metal surface and it is given as

$W_{0} =\frac{hc}{ \lambda}$

Here W_{0} is the work function, h is plank constant and c is the speed of light.

Given W_{0} = 4.2 eV and we take $h =6.6\times10^-^34m^2kg/s$ and $c=3\times10^8m/s$

Substitute the given values, we get

$\lambda =\frac{6.6\times10^-^3^4\times3\times10^8}{ 4.2\times1.6\times10^-^1^9}$

$=2946\times10^-^1^0$

$\lambda =2946A^{0}$

Thus, the maximum wavelength which can eject electrons from this metal surface is $2946A^{0}$

Learn More:

Work function

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Answer 2

Answer:

Work hey ur answer function is the minimum energy required to eject an electron from the metal surface.

work function=hv°

Threshold frequency=c/^=3×10^8/330×10^-9=1×10^17/11=8^-1

work function=6.626×10^-34×10^17/11=6×10^-19J

Explanation:

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