5-B - 1 Atomic Spectra • Blackbody radiation is the...

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Unformatted text preview: 1 Atomic Spectra • Blackbody radiation is the visible glow that solid objects emit when heated. • Max Planck (1858–1947): proposed the energy is only emitted in discrete packets called quanta . • The amount of energy depends on the frequency: λ E = h ν = hc h = 6.626 × 10- 34 J ⋅ s 2 Atomic Spectra • Albert Einstein (1879–1955): • Used the idea of quanta to explain the photoelectric effect. • He proposed that light behaves as a stream of particles called photons . 3 Atomic Spectra • A photon’s energy must exceed a minimum threshold for electrons to be ejected. • Energy of a photon depends only on the frequency. 4 Atomic Spectra • For red light with a wavelength of about 630 nm, what is the energy of a single photon and one mole of photons? λ E = h ν = hc h = 6.626 × 10- 34 J ⋅ s 5 Wave–Particle Duality • Louis de Broglie (1892–1987): Suggested waves can behave as particles and particles can behave as waves. This is called wave–particle duality....
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5-B - 1 Atomic Spectra • Blackbody radiation is the...

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