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AS 2 Waves, Photons and Medical Physics

Quick questions on Quantum physics and the photoelectric effect: photons, work function and Einstein's equation - 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.

What is q1?
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A metal has a work function of 3.2×10−19 J3.2 \times 10^{-19}\ \text{J}. Light of frequency 7.0×1014 Hz7.0 \times 10^{14}\ \text{Hz} shines on it. Find the maximum kinetic energy of the emitted electrons.
What is q2?
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Explain why no electrons are emitted below the threshold frequency. [2 marks]
What is q3?
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Calculate the energy of a photon of red light of wavelength 6.5×10−7 m6.5 \times 10^{-7}\ \text{m}. 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}. [2 marks]

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