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

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Q1
Q2
. . . .
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18

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18

(a)

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2 Mark s

Using information in the table, describe how a proton changes into a neutron.

p is uud

n is udd

(If candidates have p and n correct but think neutrino or beta plus (e+)

are composed of quarks, score 1 mark only)

18

(b)

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2 Mark s

With reference to the charges of the particles, show that this decay is possible.

Identifies the charge of all four particles

Or see ?1 → 0 ? ??1? ? 0 (assume charge written in same order as

symbols in equation unless otherwise stated)

Charge is conserved

(Only award MP2 if an attempt at MP1 has been made, e.g. candidate

only identifies positive particles)

(Accept methods that use charge conservation of individual quarks of

the proton and neutron. However, those who think the neutrino or beta

plus (e+) are composed of quarks can only score a max of 1 mark)

18

(c)

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4 Mark s

electron and two photons of equal energy are emitted.

Calculate the wavelength of the emitted photons.

Wavelength =

18

(d)

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18

(d) (I)

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3 Mark s

At these energies, the energy and momentum of a particle are connected by the

relativistic equation E = pc.

Wavelength =

18

(d) (II)

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2 Mark s

hydrogen target which consists of protons. Suggest, with reasons, what happens

to the path of the electrons.

Either

Idea that path of electrons may be deflected

Due to the (electrostatic) force between electrons and protons / quarks

Or

Diffraction

wavelength of electron is similar to diameter/gap for proton/quark

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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.