Maths for GCSE Biology 3 - Magnification

If the scale bar measures 60 mm and the actual size it represents is 30 μm , what is the magnification?

• 2,000X

• 150X

• 5,000X

• 20X

If a scale bar measures 32 mm and it states it's length is 100 μm, what is the magnification?

• 320 x

• 3,200 x

• 0.32 x

• 32,000 x

If a bacteria image measures 450 mm and the magnification is 15,000x, what is the actual size of the bacteria?

• 30 µm
• 0.3 µm
• 300 µm
• 3,000 µm

Serena measured the image of one of the bacterial cells to be 32 mm. If the magnification of the image is 8,000X, what is the actual size of the bacterial cell?

• 4 μm

• 0.004 μm

• 256,000 μm

• 0.25 μm

Tags

NGSS.MS-LS1-1

The scale bar of measures 3 mm but its actual size is 50 nm. What is the magnification of this image?

Remember: 1 mm = 1,000,000 nm

• 60,000X

• 60X

• 600X

• 6,000X

To calculate magnification we use......

• image size x actual size
• image size ÷ actual size
• actual size ÷ image size

To calculate image size we use.....

• actual size x magnification
• magnification ÷ actual size
• actual size ÷ magnification

To calculate actual size we use.....

• image size ÷ magnification

• image size x magnification

• magnification ÷ image size

If the image measures 100 mm and the scale bar is is 50 µm, what is the magnification?

• 2,000 x
• 150 x
• 5,000 x
• 20 x

If a scale bar measures 32 mm and it states it's length is 100 µm, what is the magnification?

• 320 x
• 3,200 x
• 0.32 x
• 32,000 x