Which is the more reasonable measurement of the diameter of a blood cell:
7.4•10^−3 mm or 7.4•10^3 mm? Justify your answer.
I think it is 7.4•10^-3 but I'm not sure.

Question

Which is the more reasonable measurement of the diameter of a blood cell:
7.4•10^−3 mm or 7.4•10^3 mm? Justify your answer. 
I think it is 7.4•10^-3 but I'm not sure.

zbz · Answer

You are correct!

So here's the step-by-step explanation:
    The actual measurement of the diameter of a blood cell is 6 to 8 μm
Let diameter be d
     6x + 10^-6m(less than or equal to) d (less than or equal to) 8x10^-6m
Now we check the given measurement between the range.
     7.4 x 10^-3mm
Change into meter. As we know 1000 mm = 1m or 1mm = 10^-3 m
     7.4 x 10^-3 x 10^-3m
     7.4 x 10^-6m
     7.4 x 7.4 x 10^3mm
     7.4 x 10^3 x 10^-3m
     7.4m
So, 7.4 x 10^-6m lie between 6 x 10^-6m (less than or equal to) d (less than or equal to) 8 x 10^-6m
Hence,  7.4 x 10^-6m more reasonable measurement of diameter of blood cell because it lies between range of diameter of blood cell.

gababb09 · Answer

I did not need an explanation I just wanted to know if I was correct. But I very much appreciate the explanation it can help me with future questions. thank you very much.😊

zbz · Answer

Np! Glad I could help :D