Strike Target
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on December 6, 2009
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Strike Target
If the beam is incident on a target, how many protons strike the target in a period of 22s?
A proton beam in an accelerator carries a current of 130 µA. If the beam is incident on a target, how many protons strike the target in a period of 22.0 s?
Answer in # of protons.
Current is charge per unit time (I=q/t), so the total charge hitting the target per second is 130 µC. Work out how many protons this is, using the charge per proton as 1.6E-19C. Finally, multiply by 22.
Air strikes target, kill al-Qaeda terrorists near Taji, Iraq