State one medical use for optical fibres. (b) Light is shone down an optical fibre as shown. The intensity of the light coming out of the fibre is 5.0 W/m². (i) 1% of the intensity is lost as it travels through the fibre. Calculate the intensity of the light as it enters the fibre.

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State one medical use for optical fibres - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1

Question 5

State one medical use for optical fibres. (b) Light is shone down an optical fibre as shown. The intensity of the light coming out of the fibre is 5.0 W/m². (i) 1... show full transcript

Worked Solution & Example Answer:State one medical use for optical fibres - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1

Step 1

1% of the intensity is lost as it travels through the fibre

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Answer

To find the intensity of the light entering the fibre, we first calculate the amount of intensity lost:

ext{Loss} = 0.01 	imes 5.0 	ext{ W/m²} = 0.05 	ext{ W/m²}.

Then, we subtract this loss from the original intensity:

ext{Intensity at entry} = 5.0 	ext{ W/m²} + 0.05 	ext{ W/m²} = 5.05 	ext{ W/m²}.

Step 2

Calculate the intensity of the light as it enters the fibre

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Answer

Having determined that the light entering the fibre has an intensity of 5.05 W/m², this is the final answer required.

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