Question
In: Chemistry
When light of wavelength equal to 364 nm strikes a metal, the kinetic energy of the...
When light of wavelength equal to 364 nm strikes a metal, the kinetic energy of the ejected electron is 4.12 × 10-19 J. What is the work function of the metal?
Solutions
Expert Solution
Hi,
The given values are Wave length = 364nm
KE of ejected electron is = 4.12
10-19
J
Now form the Photo electric effect its given that
h
= 
+
KE ( = work
function, = frequency, =
c/
, h= plank's
constant =6.626 10-34
Js-1 )
= (3.0108
cm/s)/ 364 10-9
cm
= 8.2417 1014
s-1
Now, substitute in the above equation,
6.626 10-34
Js-1 8.2417
1014 s-1= + 4.12
10-19
J (given)
54.609 10-20
J = + 4.12
10-19
J
= 54.609
10-20 J - 41.2 10-20
J
= 13.409 10-20
J
Therefore the workfunction of metal is 13.409
10-20 J.
queen_honey_blossom answered 2 years agoRelated Solutions
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