CHM135H1 Lecture Notes - Lecture 4: Threshold Energy, Photon Energy, Photon
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CHM135H1 Full Course Notes
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Chm135h1 f - lecture 4 - chapter 5 (2) Wave particle duality: electromagnetic radiation as a wave. Electromagnetic radiation is both a wave as well as a particle; its wave nature is, for example, evidenced by its diffraction patterns. As a wave, it has both wavelength and frequency. = wavelength (m), = frequency (s 1), e = energy, c = speed of light. = c = 3. 0 108 ms 1 don"t need to memorize speed of light. Amplitude (or intensity) - tells us about the number of photons in the light; observed as brightness. Frequency and wavelength - tells us about the energy of the photons; observed as color of light. Frequency - number of waves that pass by a point in one second. Waves can combine or cancel out to increase or decrease amplitude: x x. Recall that wavelength is inversely proportional to energy. Wave a has double the energy of wave b.
