To divide the numbers in scientific notation \((3 \times 10^5)\) by \((5 \times 10^3)\), you can follow these steps:
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Divide the coefficients: \[ \frac{3}{5} = 0.6 \]
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Subtract the exponents of 10: \[ 10^{5-3} = 10^2 \]
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Combine the results: \[ 0.6 \times 10^2 \]
Since scientific notation typically has a coefficient between 1 and 10, we can express \(0.6\) in this form:
\[ 0.6 = 6.0 \times 10^{-1} \]
Now, substitute this back into the equation:
\[ 0.6 \times 10^2 = (6.0 \times 10^{-1}) \times 10^2 \]
Now combine the powers of 10:
\[ 6.0 \times 10^{-1 + 2} = 6.0 \times 10^1 \]
Thus, the final answer in scientific notation is:
\[ \boxed{6.0 \times 10^1} \]