OCR A Level Physics

Topic Questions

A LevelPhysicsOCRTopic Questions4. Electrons, Waves & Photons4.11 Photons & Wave-Particle Duality

4.11 Photons & Wave-Particle Duality

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11 mark

What can be deduced from the diffraction of electrons by a thin film of graphite?

  • Electrons are leptons.

  • Electrons are negatively charged.

  • Electrons interact with atoms on a one-to-one basis.

  • Electrons travel as waves.

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1
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An electron has a de Broglie wavelength equal to the wavelength of X-rays.
What is the best estimate of the momentum of this electron?

  • 10−30 kg ms−1

  • 10−27 kg ms−1

  • 10−23 kg ms−1

  • 10−18 kg ms−1

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2
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 Electron diffraction provides evidence for the wave-like behaviour of particles. A thin graphite film diffracts electrons. Electrons are accelerated from rest through a potential difference of 300 V. The final speed of the electrons is 1.0 × 107 ms−1.

What is the de Broglie wavelength λ (m)  of the electrons?

  • 7.1 × 10−11

  • 8.3 × 10−11

  • 9.3 × 10−11

  • 10.3 × 10−11

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3
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In an experiment the de Broglie wavelength of an electron after being accelerated through a potential difference (p.d) V is λ1.

The accelerating p.d is now tripled.

What is the new de Broglie wavelength of the electron in terms of λ1?

  • lambda subscript 1 over 3

  • fraction numerator lambda subscript 1 over denominator square root of 3 end fraction

  • square root of 3 lambda subscript 1

  • 3 lambda subscript 1

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4
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A neutron has a kinetic energy of 9.00 x 10−18 J.

Which is the correct expression for the de Broglie wavelength λ of the neutron?

  • lambda equals fraction numerator 6.63 cross times 10 to the power of negative 34 end exponent over denominator 2 cross times 1.675 cross times 10 to the power of negative 27 end exponent cross times 9.00 cross times 10 to the power of negative 18 end exponent end fraction

  • lambda equals fraction numerator 6.63 cross times 10 to the power of negative 34 end exponent over denominator 2 cross times 9.11 cross times 10 to the power of negative 31 end exponent cross times 9.00 cross times 10 to the power of negative 18 end exponent end fraction

  • lambda equals fraction numerator 6.63 cross times 10 to the power of negative 34 end exponent over denominator square root of 2 cross times 1.675 cross times 10 to the power of negative 27 end exponent cross times 9.00 cross times 10 to the power of negative 18 end exponent end root end fraction

  • lambda equals fraction numerator 6.63 cross times 10 to the power of negative 34 end exponent over denominator square root of 2 cross times 9.11 cross times 10 to the power of negative 31 end exponent cross times 9.00 cross times 10 to the power of negative 18 end exponent end root end fraction

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