Percentage transmittance gamma ray through lead

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Adam Rabe
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Homework Statement


I = Io e-ux.PNG


Homework Equations


I = Io e^-ux

The Attempt at a Solution


0.75 = 1 * e^-u1
using algebra... u =2.117

I = 1 * e^-2.117*3
I = 0.00175

Answer is apparently 42.2. Can someone tell me where i went wrong? Thanks for any help as always
 

Discussion

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Adam Rabe said:
0.75 = 1 * e^-u1
using algebra... u =2.117
Check your math. When I put ##e^{-2.117}## into my calculator, I don't get 0.75.
 
Drakkith said:
Check your math. When I put ##e^{-2.117}## into my calculator, I don't get 0.75.
omfg i got it. thanks a lot i derped out with the log rules.