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Edexcel | Physics WPH0 | W 16 4 1 | 1 hour 30 minutes

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A mass spectrometer is a device used to identify atoms by measuring the mass-charge

Ionised atoms in a vacuum are accelerated from rest through a potential difference V and

then enter an evacuated tube.

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(a)

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2 Mark s

An ion of mass m is accelerated to a velocity v.

Show that the mass-charge ratio of the ion is given by

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(b)

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3 Mark s

The electromagnet shown in the diagram provides a magnetic field which is used to

deflect the ion along the tube of the spectrometer.

Explain how a magnetic field can be used to deflect the ion into a circular path.

(QWC – Work must be clear and organised in a logical manner using

technical wording where appropriate)

the (magnetic) field acts at a right angle to the direction of motion

Or the velocity of the ion is perpendicular to the (magnetic) field

the force is perpendicular to the direction of motion.

the force acts as a centripetal force

Or this is the condition for circular motion

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(c)

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4 Mark s

An atom of bromine is ionised by the removal of one electron. It is accelerated

through a potential difference of 3.0 kV and then enters the tube. The ionised atom is

Calculate the radius of curvature r of the tube.

r =

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