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Module 7: The Nature of Light

Quick questions on Quantum model of light and the photoelectric effect: HSC Physics Module 7

6short 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 einstein's photon hypothesis (1905)?
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Building on Planck's 1900 idea that energy is exchanged in discrete amounts hfh f, Einstein proposed that light itself is made of discrete energy packets:
What is threshold frequency?
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The minimum frequency that can eject any electron is the one where KEmax⁡=0KE_{\max} = 0:
What is planck's constant?
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h=6.626×10−34h = 6.626 \times 10^{-34} J s is the universal constant relating frequency to energy quantum. It also appears in:
What is q1?
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State the photoelectric equation and explain what each term means. [2 marks]
What is q2?
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A metal has work function ϕ=4.5 eV\phi = 4.5 \text{ eV}. (a) Find the threshold wavelength. (b) When illuminated by λ=200 nm\lambda = 200 \text{ nm} light, calculate the maximum kinetic energy of photoelectrons.
What is q3?
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A photoelectric experiment plots KEmax⁡KE_{\max} versus frequency. (a) State the gradient and y-intercept of this graph. (b) Explain how the graph yields Planck's constant.

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