A metal surface is illuminated by light of two different wavelengths $250 nm$ and $300 nm .$ The maximum speeds of ejected electrons corresponding to these wavelengths are $v_{1}$ and $v_{2}$ respectively. If the ratio of $v_{1} : v_{2} = 2 : 1.$ The work function of the metal is nearly-
$[Use h c = 1240 eV nm]$

Question

A metal surface is illuminated by light of two different wavelengths

250 nm

and

300 nm .

The maximum speeds of ejected electrons corresponding to these wavelengths are

v_{1}

and

v_{2}

respectively. If the ratio of

v_{1} : v_{2} = 2 : 1.

The work function of the metal is nearly-

[Use h c = 1240 eV nm]

Toppr Admin · Accepted Answer

a metal surface is illuminated by light of two different wavelengths $${ \lambda }_{ 1 }=500nm$$ and $${ \lambda }_{ 2 }=620nm$$. The maximum speed of ejected photo-electrons corresponding to these wavelengths are in the ratio 3 : 2. Then work function of the metal is nearly :