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Edexcel | Physics 4PH0 | S 10 3 | Q3

Boards | Edexcel | Physics 4PH0

Search By AI inside Physics 4PH0 | Type Exam Code | Subject Code | keyword To Search

3

Photoelectric cells transfer light energy to electrical energy.

A photoelectric cell generates only a small voltage. Therefore a set of photoelectric cells,

called a panel, is often used.

A student investigates the relationship between the voltage across a panel and the distance,

d, between a lamp and the panel. All the student’s distances are less than one metre.

3

(a) (I)

1 Mark

What could the student use to measure d ?

metre rule(r)

100 cm rule(r)

measuring tape

tape measure

rule(r)

metre stick

3

(a) (II)

3 Mark s

Suggest the difficulty the student will have in making an accurate measurement

of d. Explain how the student could overcome this difficulty.

Acceptable Answers

Extra Information

difficulty

measuring to the centre/filament

of the lamp

any two (1) each:

explanation

measure between glass and filament

add to reading (of rule)

view from the side or top

mark/note position level with filament

(on glass)

mark/note centre of base

measure from the point specified dop

while lamp is off/before lamp is on

owtte e.g. ‘you

cannot put the metre

rule to the filament’

ignore references to

orientation of metre

rule

dna remove glass

3

(b)

2 Mark s

The student carries out the investigation in a darkened room.

Explain why.

Acceptable Answers

Extra Information

either

so that only light from the lamp

affects the panel / cells / voltage

/ results /readings

or

so that there is no background

/external light

to affect the panel / cells / voltage

Ignore experiment(al)

/test /investigation

ignore experiment(al) /

3

(c)

The student makes a note of six pairs of results.

3

(c) (I)

3 Mark s

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

Acceptable Answers

Extra Information

appropriate headings

all in order

units given in heading or

in body of table

centimetres/cm

and as millivolts/mV

columns either way round

d and V are minimum

description of variables

accept distance,length, voltage,

millivoltage, p.d. , potential

difference, millivoltmeter

reading, emf

dna volts, millivolts

ascending or descending

seen at least once and with no

contradiction

3

(c) (II)

4 Mark s

Plot these points on the grid on the opposite page.

Label the axes.

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

correct units

all points plotted correctly to half

a small square

curve of best fit

same criteria as for

column headings

each incorrect or

missing (-1)

down to (0) for points

do not credit dot to

dot with or without the

use of a ruler

3

(c) (III)

1 Mark

Use your graph to find the value of the voltage, in millivolts, across the panel

when d is 25 cm.

voltage = .............................. mV

correct reading from candidate’s

line to within 1 mm (half a small

square)

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