Electron beam of a computer monitor

[JJones_86]

Homework Statement

The current in the electron beam of a computer monitor is 410 µA. How many electrons per second hit the screen?

Homework Equations

The Attempt at a Solution

A beam current of 410µA means that 410µC of charge strike the screen per second. This is equivalent to (410e-6C)/(1.6×10-19C/e) = 6.56e-23 electrons...

But it's telling me that it's the wrong answer, any help is appreciated!

 

[mgb_phys]

I don't think you mean 10^-23electrons
410 x10^-6 / 1.6 x10^-19 = 410/1.6 x10^{-6 - -19} = 250 x10^{-6 +19} = 250 x10⁺¹³

It's worth knowing the rules for doing calculations with exponents so you can estimate the answer before entering the numbers in a calculator

 

[JJones_86]

Oops, calculator error, thanks!