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Grade: upto college level

                        

Electric fields can be used to pull electrons out of metals. To remove an electron from tungsten, the electric field must do 4.5 eV of work. Suppose that the distance over which the electric field acts is 3.4 nm. Calculate the minimum force that the field must exert on the electron being removed.

5 years ago

Answers : (1)

Navjyot Kalra
askIITians Faculty
654 Points
							We have to find out the minimum force (F) that the field must exert on the electron being removed.
To obtain the minimum force (F), substitute 4.5 eV for W and 3.4 nm for s in the equation F = W/s,
F = W/s
= (4.5 eV/3.4 nm)
= (4.5 eV/3.4 nm) (1.6×10-19 J/1 eV) (1 nm/10-9 m)
= 2.1×10 -10 J/m
= 2.1×10 -10 N …… (3)
From equation (3) we observed that, the minimum force (F) that the field must exert on the electron being removed would be 2.1×10 -10 N.
5 years ago
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