To find the difference between the diameters of Cell P and Cell Q, you would need to subtract the diameter of Cell Q from the diameter of Cell P. This can be expressed mathematically as:
\[ \text{Difference} = \text{Cell P} - \text{Cell Q} \]
Substituting the given values:
\[ \text{Difference} = (5.0 \times 10^{-4} , \text{m}) - (3.0 \times 10^{-5} , \text{m}) \]
You would need to convert the two values to the same power of ten before performing the subtraction. In this case, you can convert \(3.0 \times 10^{-5}\) to the same power as \(5.0 \times 10^{-4}\):
\[ 3.0 \times 10^{-5} = 0.3 \times 10^{-4} \]
Now the expression becomes:
\[ \text{Difference} = (5.0 \times 10^{-4} , \text{m}) - (0.3 \times 10^{-4} , \text{m}) = (5.0 - 0.3) \times 10^{-4} , \text{m} \]
Calculating that gives:
\[ \text{Difference} = 4.7 \times 10^{-4} , \text{m} \]
Thus, the expression to find the difference between the two diameters is:
\[ (5.0 \times 10^{-4}) - (3.0 \times 10^{-5}) \]