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In experiments on photosynthesis, it is often necessary to compare different light intensities - OCR Gateway - GCSE Biology - Question 14 - 2021 - Paper 1

Question 14

In experiments on photosynthesis, it is often necessary to compare different light intensities. A plant 20 cm from a light receives a light intensity of 25 arbitrar... show full transcript

Worked Solution & Example Answer:In experiments on photosynthesis, it is often necessary to compare different light intensities - OCR Gateway - GCSE Biology - Question 14 - 2021 - Paper 1

Step 1

What light intensity does a plant receive 10 cm from the light?

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Answer

To find the light intensity at a distance of 10 cm, we can use the inverse square law, which states that light intensity is inversely proportional to the square of the distance from the light source.

Given:

Distance at which the intensity is given (d1) = 20 cm
Light intensity at this distance (I1) = 25 arbitrary units
Distance we want to find intensity for (d2) = 10 cm

Using the formula:

$I_2 = I_1 \left(\frac{d_1}{d_2}\right)^2$

Substituting the values:

$I_2 = 25 \left(\frac{20}{10}\right)^2$

Calculating:

$I_2 = 25 \left(2\right)^2 = 25 \times 4 = 100$

Thus, the light intensity the plant receives at 10 cm from the light is 100 arbitrary units. Therefore, the correct answer is C.

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In experiments on photosynthesis, it is often necessary to compare different light intensities - OCR Gateway - GCSE Biology - Question 14 - 2021 - Paper 1

Worked Solution & Example Answer:In experiments on photosynthesis, it is often necessary to compare different light intensities - OCR Gateway - GCSE Biology - Question 14 - 2021 - Paper 1

What light intensity does a plant receive 10 cm from the light?

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