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Edexcel | Physics WPH0 | W 17 4 1 | 1 hour 30 minutes

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17

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The diagram shows the parts of an electron deflection tube.

17

(a)

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2 Mark s

The electron gun consists of a hot metal filament and a positively charged anode.

Explain how this produces a beam of electrons.

Electrons emitted from hot metal (surface)

Or states thermionic emission

Idea that electrons accelerated by electric field produced by charge on the anode

(e.g. Electrons accelerated by anode; electrons attracted to positive charge;

electrons attracted to anode)

17

(b)

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3 Mark s

The potential difference between the hot metal filament and the anode is 2.1 kV.

Calculate the velocity of the electrons as they leave the electron gun

Velocity=...................

17

(c)

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2 Mark s

The electron beam passes between plates across which a potential difference has been applied. The electron beam is deflected, as shown in the photograph.

On the diagram below, sketch the electric field between the plates.

Straight vertical lines, at least 3, equally spaced, touching both plates

Downward direction

17

(d)

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A potential difference of 550 V is applied across the plates of another deflection tube.

The vertical separation of the plates is 5.0 cm.

17

(d) (I)

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3 Mark s

Show that the electrostatic force on an electron between the plates is about

17

(d) (II)

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4 Mark s

The electrons in the beam enter the region between the plates with a horizontal

velocity of

Determine the vertical deflection of the beam after travelling 10 cm horizontally

between the plates

Vertical deflection = ..........................

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