WPH0 QR Dynamic Papers Physics al Edexcel

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Edexcel | Physics WPH0 | W 18 4 1 | 1 hour 30 minutes

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When an X-ray photon interacts with an atomic nucleus, pair production can occur.

In pair production the photon energy produces an electron and a positron.

For this to occur, the wavelength of the X-ray photon must be less than a certain value.

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4 Mark s

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Initial charge is zero, so final charge must be zero

Or charge would not be conserved

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Energy of electron reduces through collisions/ionisations

Or electron is absorbed by an atom/ion/nucleus

Positron will meet an electron and annihilate

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All the included past papers are copyrighted © University of Cambridge Local Examinations Syndicate (UCLES), which we have collected from various online sources and gathered together in one website.