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Edexcel | Physics 4PH0 | W 10 3 | Q2

W 10 3

2

(a)

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2 Mark s

A student investigates the relationship between the voltage across a solar panel and the

area that is exposed to light.

He uses the arrangement shown in the diagram.

The student uses a 30 cm rule to measure the sides of the part of the panel that is exposed

to light.

Suggest and explain the purpose of the black card.

...............................................................................................................................

Acceptable Answers

Extra Information

to prevent light getting to other parts

of the panel

so that only some of the panel is

exposed/different areas of the panel

can be exposed

Allow ‘absorbs light’ but

not ‘absorbs heat’

W 10 3

2

(b)

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1 Mark

State why the student carries out the investigation in a blacked-out room.

...............................................................................................................................

to prevent light from the room reaching

the panel/interfering with the result

W 10 3

2

(c)

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2 Mark s

During the investigation the student uses the same panel and the same lamp.

List two other variables which the student needs to keep constant.

1 ....................................................................................................................................

2 ...............................................................................................................................

Acceptable Answers

Extra Information

distance between the (centre of) the

lamp and the (centre of) the panel

voltage/current/power (to the lamp)

/light intensity

accept ‘the same distance’

allow ‘same voltage

supply’

W 10 3

2

(d) (I)

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2 Mark s

The diagram shows the voltage reading across the solar panel when a square area of

side 8 cm is exposed to light.

Complete the sentence.

The meter is a ................................................... and the reading is ............... mV.

(milli)voltmeter

370 (mV)

W 10 3

2

(d) (II)

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1 Mark

Calculate the area, in cm2, of a square of side 8 cm.

................................................................................................................................

Area = .............................. cm2

W 10 3

2

(e) (I)

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3 Mark s

Another student carries out a similar investigation.

Her results for exposed area and voltage are shown.

Put these results into a suitable table with column headings and units.

Acceptable Answers

Extra Information

appropriate headings

units given in

(mV)

all in order

W 10 3

2

(e) (II)

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6 Mark s

On the grid below, plot a graph of voltage against exposed area.

Label both axes and add a suitable scale to the vertical axis.

Decide whether a straight line of best fit or a curved line of best fit is appropriate

and draw it on your graph.

Acceptable Answers

Extra Information

both axes labelled correctly and

with area on the x axis

both axes with correct units

scale of 10 mm equivalent to 50

mV on the y axis

all points plotted correctly

line of best fit

maximum penalty of 1 mark

for unit error/omission in (e

-1 for each error

down to zero

dna ‘blobs’

dna tramlines or

dot to dot

with or without a ruler

W 10 3

2

(e) (III)

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1 Mark

Use your graph to find the voltage, in millivolts, across the solar panel when the

exposed area is 100 cm2.

Voltage = .......................... mV

Acceptable Answers

Extra Information

in the range 410 - 420

or correct reading from

candidate’s line

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