WPH0 QR Dynamic Papers Physics al Edexcel

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(a) (I)

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2 Mark s

An electron is shown between tubes B and C.

The circles on the diagram indicate the terminals of the a.c. supply.

Indicate on the diagram their polarity when the electron is between

tubes B and C.

Explain your answer.

(a) (II)

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1 Mark

Explain why it is necessary for the tubes to increase in length along the linac.

(a) (III)

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3 Mark s

The peak voltage of the a.c. supply is 250 kV.

Calculate the increase in electron kinetic energy, in joules, as the electron moves

from tube A to tube D.

Increase in kinetic energy =

(b)

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The Antiproton Decelerator at CERN slows down very high energy antiprotons to

produce anti-atoms such as anti-hydrogen.

The diagram is a representation of a hydrogen atom and an anti-hydrogen atom.

(b) (I)

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1 Mark

Use the boxes in the diagram to identify the particles in the anti-hydrogen atom.

(b) (II)

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2 Mark s

State one difference and one similarity between the electron and its corresponding

particle in the anti-hydrogen atom.

(b) (III)

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1 Mark

State what would happen if a hydrogen atom collided with an anti-hydrogen

atom.

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2 Mark s

Explain what is meant by a charge of +2/3.

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2 Mark s

State the predicted mass and charge of the ū quark.

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3 Mark s

Calculate the mass of the sˉ quark in kg.

Mass = kg

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