To calculate \( 4.8 \times 10^{-3} - 9.4 \times 10^{-6} \), we first need to express both numbers with the same exponent.
We can convert \( 4.8 \times 10^{-3} \) to \( 4.8 \times 10^{-3} = 4.8 \times 10^{-3} \times \frac{1000}{1000} = 4800 \times 10^{-6} \).
Now we can rewrite the expression:
\[ 4800 \times 10^{-6} - 9.4 \times 10^{-6} \]
Now we perform the subtraction:
\[ (4800 - 9.4) \times 10^{-6} = 4790.6 \times 10^{-6} \]
Next, we express \( 4790.6 \) in scientific notation.
To convert \( 4790.6 \) to scientific notation, we can write it as:
\[ 4.7906 \times 10^{3} \]
So now we combine this with \( 10^{-6} \):
\[ 4.7906 \times 10^{3} \times 10^{-6} = 4.7906 \times 10^{-3} \]
Finally, rounding to 2 decimal places gives:
\[ 4.79 \times 10^{-3} \]
Thus, the final answer is:
\[ \boxed{4.79 \times 10^{-3}} \]