Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-9702-QP2-0012 marksL1 FoundationCalculatorde Broglie wavelength

Calculate the de Broglie wavelength of an electron moving at

2.0\times10^6

m s⁻¹, in nm. (

h=6.63\times10^{-34}

J s;

m_e=9.11\times10^{-31}

kg)

Salam Academy Original Practice · Proposed mark scheme

SA-9702-QP2-0031 markL1 FoundationCalculatorDuality evidence

Evidence for the wave nature of electrons comes from

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SA-9702-QP2-0041 markL1 FoundationCalculatorDuality evidence

Evidence for the particle nature of electromagnetic radiation comes from

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SA-9702-QP2-0061 markL1 FoundationCalculatorde Broglie wavelength

The speed of an electron doubles. State the factor by which its de Broglie wavelength changes, as a decimal.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-QP2-0101 markL1 FoundationCalculatorde Broglie wavelength

A proton and an electron have the same speed. The proton's de Broglie wavelength is

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SA-9702-QP2-0121 markL1 FoundationCalculatorde Broglie wavelength

The de Broglie wavelength of a particle is equal to

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SA-9702-QP2-0022 marksL2 StandardCalculatorde Broglie wavelength

Electrons are accelerated from rest through

5000

V. Calculate their de Broglie wavelength, in units of

10^{-11}

m. (

h=6.63\times10^{-34}

J s;

m_e=9.11\times10^{-31}

kg;

e=1.60\times10^{-19}

Salam Academy Original Practice · Proposed mark scheme

SA-9702-QP2-0051 markL2 StandardCalculatorDuality evidence

In an electron diffraction tube, the accelerating p.d. is increased. The rings on the screen

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SA-9702-QP2-0071 markL2 StandardCalculatorde Broglie wavelength

The accelerating p.d. for an electron beam is increased by a factor of

4

. State the factor by which the de Broglie wavelength changes, as a decimal.

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SA-9702-QP2-0081 markL2 StandardCalculatorDuality evidence

Graphite is used in electron diffraction experiments because

Salam Academy Original Practice · Proposed mark scheme

SA-9702-QP2-0091 markL2 StandardCalculatorde Broglie wavelength

Calculate the speed of an electron with a de Broglie wavelength of

1.0\times10^{-10}

m, in units of

10^6

m s⁻¹. (

h=6.63\times10^{-34}

J s;

m_e=9.11\times10^{-31}

kg)

Salam Academy Original Practice · Proposed mark scheme

SA-9702-QP2-0113 marksL3 ExamCalculatorde Broglie wavelength

Calculate the p.d. through which electrons must be accelerated from rest to have a de Broglie wavelength of

1.0\times10^{-10}

m. (

h=6.63\times10^{-34}

J s;

m_e=9.11\times10^{-31}

kg;

e=1.60\times10^{-19}

Salam Academy Original Practice · Proposed mark scheme