IBPhysicsHLTopic QuestionsNuclear & Quantum PhysicsQuantum Physics

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First teaching 2023

First exams 2025

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Quantum Physics (HL IB Physics)

Topic Questions

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1
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Which of the following is evidence for the wave nature of electrons?

  • Electron diffraction from crystals

  • The photoelectric effect

  • Continuous energy spectrum in β– decay

  • Pair production

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2
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Which of the following experiments provides evidence for the particle nature of light?  

  • Gamma decay

  • Young's double slit

  • The photoelectric effect

  • Electron diffraction

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3
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According to the de Broglie equation, the wavelength of the electron is

  • directly proportional to the mass of the electron

  • inversely proportional to the square of the velocity of the electron

  • directly proportional to the velocity of the electron

  • inversely proportional to the mass of the electron

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4
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Which of the following metals will exhibit the photoelectric effect most readily?

 

metal

work function / eV

A

sodium

2.3

B

caesium

2.1

C

calcium

2.9

D

silver

4.3

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1
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A vacuum photocell is connected in series with a power supply, a variable resistor, and a sensitive ammeter. A voltmeter is connected in parallel across the photocell.

q28_the-photoelectric-effect_aqa-as-physics-mcq

Monochromatic light of frequency f illuminates the cathode, which has a threshold frequency f0. Photoelectrons are emitted and collected by the anode. A photocurrent is measured by the ammeter.

The potential difference across the photocell, V, is increased until the ammeter reads zero. 

Which of the equations below does not correctly relate the potential V at which the current decreases to zero to the threshold frequency f0 and frequency f?

  • V space equals space h over e open parentheses f space minus space f subscript 0 close parentheses

  • f subscript 0 space equals space fraction numerator h f space minus space e V over denominator h end fraction

  • h space equals space fraction numerator e V over denominator open parentheses f space minus space f subscript 0 close parentheses end fraction

  • V space equals space fraction numerator e over denominator h f subscript 0 space minus space h f end fraction

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2
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Alpha particles of mass m are accelerated from rest through a potential difference ΔV. Which of the following gives the de Broglie wavelength of the alpha particles as a result of the acceleration? 

Use the following data: 

  • Planck's constant is h
  • The magnitude of charge on an electron is e

  • h m increment V

  • square root of 2 h m increment V e end root

  • square root of fraction numerator h over denominator m increment V end fraction end root

  • fraction numerator h over denominator square root of 4 m increment V e end root end fraction

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3
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In a Compton scattering event, incident X-rays have a wavelength of 0.0200 nm and scattered X-rays are found to have a wavelength of 0.0225 nm.

What is the kinetic energy of the recoiled electron and the angle of the scattered X-ray photon?

 

kinetic energy

scattering angle

A.

 6.9 keV 88°

B.

 55 keV 88°

C.

 6.9 keV 92°

D.

 55 keV 92°

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4
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A beam of electrons with wavelength lambda subscript R are accelerated from rest by a potential difference of 200 V and another beam of electrons with wavelength lambda subscript S are accelerated from rest by a potential difference of 1800 V.

What is the value of lambda subscript S over lambda subscript R?

  • 1 over 9

  • 1 third

  • 3

  • 9

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1
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The graph shows the scattering of electrons due to diffraction by oxygen-16 nuclei.
jCIVaS1V_12-2-ib-hl-mcqs-easy-q2-answers

Which point on the graph represents the first minimum?

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2
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Which graph shows how intensity I varies with angle θ when electrons are diffracted by a nucleus?

I9SWxx7e_12-2-ib-hl-mcqs-easy-q5-answers

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3
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At which scattering angle is the maximum energy transferred to an electron by a photon during Compton scattering?

  • 0°

  • 45°

  • 90°

  • 180°

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4
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A photon of energy E and wavelength lambda strikes a stationary electron and transfers a fraction of its energy as it scatters. The scattered photon has a wavelength of lambda apostrophe.

What is the speed of the recoiling electron?

  • square root of fraction numerator 2 lambda apostrophe over denominator m subscript e lambda end fraction end root

  • square root of fraction numerator 2 lambda over denominator m subscript e lambda apostrophe end fraction end root

  • square root of fraction numerator 2 E over denominator m subscript e end fraction open parentheses fraction numerator lambda apostrophe space minus space lambda over denominator lambda apostrophe end fraction close parentheses end root

  • square root of fraction numerator 2 E over denominator m subscript e end fraction open parentheses fraction numerator lambda apostrophe space minus space lambda over denominator lambda end fraction close parentheses end root

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