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Edexcel | Physics WPH0 | S 13 6 1 | 1 hour 30 minutes

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4

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A physicist investigates how light intensity varies with distance from a light bulb. He

sets up the apparatus as shown.

4

(a)

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1 Mark

Mark on the diagram the exact distance d he should measure.

Distance marked from filament (allow centre of bulb) to front surface of LDR

4

(b)

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1 Mark

State why the resistance R of the LDR will increase as it gets further away from the

bulb.

(As distance increases) light intensity decreases (and resistance increases

with decreasing intensity)

4

(c)

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2 Mark s

State the most important quantity to control to ensure a fair test and explain how the

physicist might control it.

Light from other sources (1)

Any suitable means of controlling outside light such as excluding it

(darkened room) or using a tube as a shield on the LDR (1)

4

(d)

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2 Mark s

The relationship between R and d is given by

where k and p are constants.

Explain why a graph of ln R against ln d will give a straight line.

Shows expansion ln R = plnd + lnk (1)

Compares with y = mx + c Or States that the gradient is p

4

(e)

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5 Mark s

He measures R for different values of d and records the following results.

Plot a graph of ln R against ln d. Use the column(s) provided to show any processed

data.

Ln & log values correct and to 3 SF consistently (allow 4SF for the values

for ln R greater than one) (1)

Labels & units on table & graph (1)

Scales (1)

Plots (1)

Line of Best Fit (1)

4

(f) (I)

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2 Mark s

Use your graph to find a value for p.

p =

Determines gradient with large triangle (at least half of the drawn line) (1)

1.13 < p < 1.23 3 SF and no units (1)

4

(f) (II)

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2 Mark s

Use your graph to find a value for k.

k =

Records intercept 0.56 < c < 0.62 (1)

k found from anti-log of their intercept (1)

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