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Cyclone Charlie

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- Homework Statement
- Question: An alpha particle (a He nucleus, containing two protons

and two neutrons and having a mass of 6.64 * 10-27 kg) traveling

horizontally at 35.6 km/s enters a uniform, vertical, 1.80-T magnetic field.

(a) What is the diameter of the path followed by this alpha particle?

- Relevant Equations
- R=mv/qb

I went with R=mv/qb, thus -> 6.64e-27*35.6e3/2*1.6e-19*1.8, and got 4.1e-4 m (metres), so diameter is 2R, 8.2e-4 m, as an answer, the reference site gives 3.95e+10 m as the answer, who's right here?

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