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Biology > Microscopes > Flashcards

Microscopes Flashcards

1
Q

How do you get from millimetres(mm) to micrometres(um)?

A

x1000 (multiply by 1000)

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2
Q

How do you get from micrometres(um) to nanometres(nm)?

A

x1000 (multiply by 1000)

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3
Q

Magnification

A

Makes objects appear bigger

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4
Q

Resolution

A

The smallest distance between two points that can still be seen as two points

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5
Q

Micrometre(um) in standard form

A

x10^-6 m (10 to the power of negative 6)

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6
Q

How do you get from picometres(pm) to nanometres(nm)?

A

Divide by 1000

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7
Q

How many picometres are there in 0.13mm?

A

130,000,000pm

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8
Q

Millimetre(mm) in standard form

A

x10^-3 m (10 to the power of negative 3)

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9
Q

What is the objective lens magnification if the total magnification is x5400 and the eyepiece lens magnification is x90?

A

objective lens magnification = total magnification / eyepiece lens magnification
x5400 (total magnification) / x90 (eyepiece magnification)
5400 / 90
= 60
objective lens magnification = x60

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10
Q

Symbol for Nanometre

A

nm

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11
Q

What is the total magnification if the eyepiece lens magnification is x10 and the objective lens magnification is x40?

A

Total magnification = eyepiece lens magnification x objective lens magnification
x10 (eyepiece lens magnification) X x40 (objective lens magnification)
10 x 40
=400
Total magnification = x400

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12
Q

Formula for working out the magnification

A

Magnification = image size / real size

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13
Q

What is the image size of the cell if the magnification used is x7000 and the real size is 25,000nm? Write your answer in mm.

A

Image size = magnification used x real size
Nanometres(mm) ➡️ millimetres = divide by 1,000,000
25,000 / 1,000,000
25,000nm = 0.025mm
x7000 (magnification used) x 0.025mm (real size)
7000 x 0.025
=175
Image size = 175mm

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14
Q

Exam question: Calculate the length of a cell which has an image size of 7 x 10^-1 mm under a magnification of x400. Write your answer in um (micrometres). [3 marks]

A

Real size = image size / magnification
= 7 x 10^-1 mm (0.7mm) / 400
=0.00175mm
x1000 = 1.75 um (micrometres)

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15
Q

How do you get from nanometres(nm) to picometres(pm)?

A

x1000 (multiply by 1000)

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16
Q

Formula for working out image size

A

Image size = magnification x real size

17
Q

How many micrometres are there in 1,000 millimetres?

A

1,000,000 um (micrometres)

18
Q

Formula for working out the total magnification

A

Total magnification = eyepiece lens magnification x objective lens magnification

19
Q

Symbol for Picometre

A

pm

20
Q

Formula for working out the eyepiece lens magnification

A

Eyepiece lens magnification = total magnification / objective lens magnification

21
Q

Formula for working out the objective lens magnification

A

Objective lens magnification = Total magnification / eyepiece lens magnification

22
Q

How do you get from millimetres(mm) to Nanometres(mm)?

A

x1,000,000 (multiply by 1,000,000)

23
Q

How do you get from Nanometres(nm) to millimetres(mm)?

A

Divide by 1,000,000

24
Q

How do you get from nanometres(um) to micrometres(um)?

A

Divide by 1000

25
Q

Formula for working out the real size

A

Real size = image size / magnification

26
Q

Picometre(pm) in standard form

A

x10^-12 m (10 to the power of negative 12)

27
Q

How many nanometres are there in 130um?

A

130,000nm

28
Q

What is the real size of the cell if the magnification used is x2200 and the image size is 750,000pm? Write your answer in mm.

A

Real size = image size / magnification used
Picometres(pm) ➡️ millimetres(mm) = divide by 1,000,000,000
750,000,000 / 1,000,000,000 = 0.75
0.75mm (image size) / x2200 (real size)
0.75 / 2200
= 0.00034091
Real size = 0.00034091mm

29
Q

How do you get from picometres(pm) to millimetres(mm)?

A

Divide by 1,000,000,000

30
Q

Nanometre(nm) in standard form

A

x10^-9 m (10 to the power of negative 9)

31
Q

What is the magnification used if the image size is 50mm and the real size is 5um (micrometres)?

A 
Magnification used = image size / real size 
50mm = 50000um
5um = 0.005 mm
50mm (image size) / 0.005mm (real size)
50 / 0.005 
= 10,000
Magnification used = x10,000
32
Q

How many micrometers are there in 1 millimetre?

A

1,000 um (micrometres)

33
Q

Formula for working out magnification

A

Real size = image size / magnification

34
Q

Symbol for Millimetre

A

mm

35
Q

Symbol for micrometre

A

um

36
Q

What is the eyepiece lens magnification if the total magnification is x700 and the objective lens magnification is x35?

A

Eyepiece lens magnification = total magnification / objective lens magnification
x700 (total magnification) / x35 (objective lens magnification)
700 / 35
= 20
Eyepiece lens magnification = x20

37
Q

How do you get from micrometres(um) to millimetres(mm)?

A

Divide by 1000

Biology (2 decks)

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