12.5 Microscopy, mm, μm, Standard form & Order of Magnitude

How many μm in 1mm?

• 10

• 1000

• 1000 000

• 100 000

• 100

To convert μm to mm......

• $\div1000$

• $\times1000$

• $\div0.001$

• $\times0.001$

An arthropod has a length of 3mm. Convert this to micrometres (μm)

• 0.003 μm

• 0.030 μm

• 30 μm

• 300 μm

• 3000 μm

An arthropod has a length of 3mm. Convert this to micrometres (μm)

• $0.3\times10^3$ μm

• $3\times10^{-3}$ μm

• $3\times10^4$ μm

• $3\times10^3$ μm

• $3\times10^{-4}$

An arthropod has a length of 3mm. What is the order of magnitude?

• -1

• -2

• -3

• -6

• -9

A second arthropod is 3.4 mm in length. Convert this to micrometres (μm)

• 34

• 340

• 3400

• 0.034

• 0.0034

An second arthropod 3.4mm in length. Convert this to micrometres (μm)

•  $0.34\times10^3$ μm

•  $3.4\times10^{-3}$  μm

•  $3.4\times10^4$  μm

•  $3.4\times10^3$  μm

•  $3.4\times10^{-4}$  μm

One arthropod has a length of 3mm and a second has a length of 3.4mm. How many times larger is the second arthropod?

• x 0.133

• x 1.200

• x 1.133

• x 1.360

• x 0.882

One arthropod has a length of 3mm and a second has a length of 3.4mm. 
What is the order of magnitude difference?

• 0

• 1

• 2

• 3

• 4

A human cheek cell has a diameter of 65μm. Convert this to millimetres (mm)

• 0.0065 mm

• 0.065 mm

• 0.65 mm

• 6500 mm

• 65000 mm