Practice IB Physics Topic E.2 Quantum Physics with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for E.2 Quantum Physics and mirrors Paper 1A, 1B, 2 style where relevant.
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What is the unit of Planck's constant?
Which experiment demonstrated that light behaves as particles?
In an experiment, light of increasing intensity but fixed frequency below the threshold frequency is shone on a metal surface. What is observed?
Which quantity is directly proportional to the energy of a photon?
A beam of electrons is accelerated through a potential difference of . The electrons then pass through a narrow slit producing a diffraction pattern on a screen.
Calculate the de Broglie wavelength of the electrons. (Electron mass , charge , Planck constant .)
Explain why the observation of diffraction patterns from electrons demonstrates wave–particle duality.
Describe how increasing the accelerating voltage affects the diffraction pattern.