B1.1 - Microscopes And Order Of Magnitude

Question 1

Order of magnitude

Answer 1

• used to make approx comparisons between objects/numbers

- using powers of 10

Question 2

Work out order of magnitude

Answer 2

-bigger number divided by smaller number

Question 3

Same order of magnitude is when…

Answer 3

The answer is less than 10

Question 4

It is one order of magnitude bigger when…

Answer 4

The answer is around ten (ten/above)

Question 5

It is 2 orders of magnitude bigger when…

Answer 5

The answer is 100

Question 6

Units for microscope

Answer 6

• 1mm = 1000 micrometers

- 1 micrometers = 1000 nanometres

Question 7

Formula for total magnifications

Answer 7

Total magnification = eyepiece lens x objective lens

Question 8

Formula for actual length / image size / magnification

Answer 8

Actual length =. Image size divided by magnification

Question 9

Formula for scale bar

Answer 9

Magnification = scale bar image divided by actual scale bar length

Question 10

Resolving power of a light microscope

Answer 10

200nm

Question 11

Resolving power of scanning electron microscope

Answer 11

10nm

Question 12

The higher the resolution….

Answer 12

The smaller the number

Question 13

Resolving power of transmission electron microscope

Answer 13

0.2nm

Question 14

Advantages of electron microscope

Answer 14

• magnify up to x 2 000 000
• high resolution
• can examine subcellular structures

Question 15

Disadvantages of electron microscope

Answer 15

• black and white images produced
• specimens have to be dead
• expensive to buy/operate
• large/difficult to move

Question 16

Advantages of light microscope

Answer 16

• natural colour of cell appears
• specimens can be living or dead
• cheap to buy/operate
• small and portable
• May be used to look at cell dividing

Question 17

Disadvantages of light microscope

Answer 17

-can only magnify up to x 2 000
-lower resolutions
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