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**[SOLVED] Cosmic Ray Protons**

## Homework Statement

Earth's atmosphere is constantly being bombarded with cosmic ray protons that originate somewhere in space. If the protons all pass through the atmosphere, each square meter of Earth's surface would intercept protons at at the average rate of 1500 protons per second. What would be the electric current intercepted by the total surface area of the entire planet?

## Homework Equations

Surface Area of sphere=4*pi*r^2

## The Attempt at a Solution

Okay, I don't even understand what this question is asking.

It wants to know the total # of protons the surface will intercept. I get that. But then it gives a rate protons per second, but does not give a tine interval.

I am lost on this one :/