To divide \( \frac{4.8 \times 10^{-6}}{2 \times 10^{-3}} \), we can separately divide the coefficients and divide the powers of 10.
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Divide the coefficients: \[ \frac{4.8}{2} = 2.4 \]
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Divide the powers of 10: \[ \frac{10^{-6}}{10^{-3}} = 10^{-6 - (-3)} = 10^{-6 + 3} = 10^{-3} \]
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Combine the results: \[ 2.4 \times 10^{-3} \]
Now, we have our result in scientific notation:
\[ \boxed{2.4 \times 10^{-3}} \]