phys117-lec13-2016-actual.pdf - 1 Physics 117 Physics 117.3...

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1 Physics 117 Physics 117.3 Lecture 13 Wed 15 June 2016 Physics 117 Today’s Scheduled Topics § 27.2 The Photoelectric Effect and the Particle Theory of Light § 27.3 X-Rays § 27.5 The Compton Effect § 28.1 Early Models of the Atom § 28.2 Atomic Spectra § 28.3 The Bohr Model Physics 117 Planck’s Hypothesis E n = nhf where: n is an integer; f is the oscillation frequency (and the frequency of the emitted electromagnetic wave); h is Planck’s constant = 6.626 × 10 -34 J·s Planck’s Hypothesis plays a role in explaining the photoelectric effect. Physics 117 Photoelectric Effect When light is incident on certain metallic surfaces, electrons are emitted from the surface. This is called the photoelectric effect. The emitted electrons are called photoelectrons. The effect was first discovered by Hertz. The successful explanation of the effect was given by Einstein in 1905. Physics 117 Fig. 27-4, p. 914 The photoelectric effect can be studied using this setup: Physics 117 Fig. 27-5, p. 914
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