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AS 2 Waves, Photons and Medical Physics

Quick questions on Wave-particle duality: de Broglie wavelength, electron diffraction and energy levels - CCEA A-Level Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

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An electron of mass 9.1×10−31 kg9.1 \times 10^{-31}\ \text{kg} moves at 2.0×106 m s−12.0 \times 10^{6}\ \text{m s}^{-1}. Find its de Broglie wavelength. Take h=6.6×10−34 J sh = 6.6 \times 10^{-34}\ \text{J s}.
What is q2?
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Explain why atomic line spectra contain only certain wavelengths. [2 marks]
What is q3?
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An electron falls between two levels, emitting a photon of energy 4.8×10−19 J4.8 \times 10^{-19}\ \text{J}. Find the wavelength of the photon. Take h=6.63×10−34 J sh = 6.63 \times 10^{-34}\ \text{J s} and c=3.0×108 m s−1c = 3.0 \times 10^{8}\ \text{m s}^{-1}.

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