Question

Scientist use microscopes to magnify very small objects so they can be seen with the human eye. If a microscope is set to magnification of 10,000 times the size of the object, how long is the actual sample of the cell if it appears to be .743 cm long?

A) 7.4 x 10^ -5
B) 7.43 x 10^ -5
C) 7.43 x 10^ -4
D) .743 x 10^ -5

Please help!

Answer 1

10,000=10⁴
0.743 cm=7.43 x 10⁻¹ cm


7.43 x10⁻¹ cm / 10⁴=7.43 x 10⁻¹ cm * 10⁻⁴=7.43 x 10⁻¹⁻⁴ cm=
=7.43 x 10⁻⁵ cm.


Answer:

B) 7.43 x 10⁻⁵