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Edexcel | Physics WPH0 | W 15 4 1 | 1 hour 30 minutes
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18
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A teacher is using an electron beam tube to demonstrate the deflection of electrons in a

uniform electric field.

A potential difference (p.d.) of 4800 V is applied between the cathode and anode of the

tube. The cathode is heated and electrons are emitted from its surface. These electrons

are then accelerated from rest and pass through a hole in the anode.

18
(a)
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1 Mark

State the name of the process by which electrons are emitted from the cathode.

Thermionic emission

18
(b)
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3 Mark s

18
(c)
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After leaving the anode, the electrons follow a parabolic path as they pass between a

pair of parallel plates with a p.d. of 800 V between them. There is a uniform electric

field between the plates.

18
(c) (I)
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3 Mark s

Calculate the force due to the electric field that acts on an electron while it is

between the plates.

Force =

18
(c) (II)
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4 Mark s

An electron experiences an upward acceleration a as it travels between the plates.

Its vertical displacement h after a time t is given by

Calculate the value of h as the electron leaves the plates.

h =

18
(d) (I)
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1 Mark

Keeping the p.d. between the cathode and anode at 4800 V, the p.d. between the

parallel plates is decreased.

Draw the new path of the electrons on the diagram in (c). Label this path A.

Path A: less curved than original (accept labelling (d)(i))

 

18
(d) (II)
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1 Mark

Keeping the p.d. between the parallel plates at 800 V, the p.d. between the

cathode and anode is decreased.

Draw the new path of the electrons on the diagram in (c). Label this path B.

Path B: more curved than original (accept labelling (d)(ii))

For both lines the curvature must change by the gap between 15 and cm on

the label below diagram. Curvature must be consistently less or more whilst

between the plates.

Minimum of one line to be labelled. If neither line is labelled then 0 marks

for both parts.

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