11. If a metal surface is irradiated with 185 nm light, electrons are ejected with a velocity of 8.90 x 105 m/s. What is the minimum frequency (in Hz) of light that could be used which will still eject electrons from the surface? |
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11)
Given:
lambda = 1.85*10^-7 m
use:
E = h*c/lambda
=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(1.85*10^-7 m)
= 1.074*10^-18 J
KE = 0.5*m*v^2
= 0.5*(9.11*10^-31 Kg)*(8.90*10^5 m/s)^2
= 3.61*10^-19 J
Now use:
KE = E - Eo
3.61*10^-19 J = 1.074*10^-18 J - Eo
Eo = 7.13*10^-19 J
use:
Eo = h*fo
7.13*10^-19 J =(6.626*10^-34 J.s)*fo
fo = 1.076*10^15 Hz
Answer: 1.08*10^15 Hz
11. If a metal surface is irradiated with 185 nm light, electrons are ejected with a...
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