Wave-particle dualityAQA A-Level Physics: Flashcards
What these 12 flashcards ask
- Which experiment suggests electromagnetic waves have a particulate nature?
- Which experiment suggests particles have wave properties?
- What is wave–particle duality?
- State the de Broglie wavelength equation.
- What does mv represent in the de Broglie equation?
- What happens to the de Broglie wavelength when the momentum increases?
- How do you find the speed of an electron accelerated through potential difference V?
- When is diffraction significant?
- What happens to electron diffraction rings when the accelerating voltage is increased?
- Why do everyday objects not show diffraction?
- What is peer review?
- Why are experimental results replicated?
Exam questions on Wave-particle duality
- A lecturer explains that the behaviour of electrons and of light cannot be described by waves alone or by particles alone.Explain how the photoelectric effect suggests that electromagnetic waves have a particulate nature.2 marks
- In a vacuum tube, electrons are accelerated through a potential difference and pass through a thin sheet of graphite. They produce a pattern of concentric rings on a fluorescent screen.Explain why the rings move closer to the centre when the accelerating potential difference is increased.2 marks
- In an electron diffraction experiment an electron is accelerated from rest through a potential difference of 250 V in a vacuum.Calculate the speed of the electron.3 marks
Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).