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ch 5 part 1

# What is the frequency of the electromagnetic

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Unformatted text preview: graphs. What is the frequency of the electromagnetic radiation from the x-ray source? c =λν ν = c/λ ν = (3.00 x108 ms −1 ) / (100 x10 −10 m) . ν = (3.00 x1018 s −1 ) A note about units: We should be familiar with the following: Angstrom nanometre micrometre Å nm m 1 Å = 1 x 10-10 m 1 nm = 1 x 10-9 m 1 m = 1x 10-6 m * 0.01 to 10 nm, corresponding to frequencies in the range 3 × 1016 - 1019 Hz. 10 5 05-Sep-13 Quantized energy and photons Question: If light is a continuum of wavelengths, then how do we explain the hydrogen emission spectrum which shows several discrete (individual) lines??? Answer: Max Planck proposed that e.m. radiation comes in units of defined energy, rather than in any arbitrary quantities. quantum Planck called the unit of light energy _________________ and he showed that its energy is given by the equation: E=hλ where h is Planck's constant = 6.63 x 10-34 J s This constant of proportionality relates the energy of a photon to its frequency All electromagnetic radiation is quantized and occurs in finite "bundles" of energy (‘photons’). The quantization implies that a photon of blue light of given frequency or wavelength will always have the same size quantum of energy...
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