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Unit 4: Revolutions in modern physics

Quick questions on Wave-particle duality and matter waves: QCE Physics Unit 4

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are mass in grams?
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Always use kg in λ=h/p\lambda = h/p.
What is q1?
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State the de Broglie hypothesis. [2 marks]
What is q2?
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Calculate the de Broglie wavelength of an electron at v=2.0×106 m s−1v = 2.0 \times 10^6 \text{ m s}^{-1}, me=9.11×10−31 kgm_e = 9.11 \times 10^{-31} \text{ kg}. [3 marks]
What is q3?
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A 50 kV50 \text{ kV} electron microscope. (a) Calculate the electron momentum and de Broglie wavelength. (b) Compare with visible-light wavelength (550 nm550 \text{ nm}) and explain the resolution advantage.

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