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The Quantum Mechanical Model: Understanding Light Waves

Discover the quantum mechanical model through the study of light, including electromagnetic radiation and visible light colors. Learn about the speed of light, wavelength, frequency, and atomic emission spectrum. Explore Max Planck's energy equations and the photoelectric effect.

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The Quantum Mechanical Model: Understanding Light Waves

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  1. Chapter 13 Section 3 -Quantum mechanical model grew out of the study of light -light consists of electromagnetic radiation -includes radio and UV waves, X-rays, gamma rays, visible light -these waves move at a constant speed of 3.00X108m/s or 3.00X1010cm/s -this is the speed of light (c)

  2. origin

  3. amplitude- height of a wave from the origin to the crest wavelength- (λ) - distance between two adjacent crests (units= m, cm, nm) frequency- (ν) - # of wave cycles that pass through a given point per unit time -(units= cycles/sec or 1/s or s-1 or hertz- Hz) -each complete wave cycle begins at the origin and returns to the origin

  4. -frequency is directly proportional to the speed at which the wave is traveling- the faster the wave, the higher the frequency -frequency and wavelength are inversely proportional

  5. visible light- light that can be seen by the human eye -wavelength determines the color of the visible light -can see colors when white light is passed through a prism -red, orange, yellow, green, blue, indigo, violet -red light has the longest wavelength (750nm) -violet has shortest (400nm)

  6. -electrons emit light when they are excited by the passage of an electric discharge through an element atomic emission spectrum- range of wavelengths emitted by a particular element that can be used to identify an element Ex- neon lights

  7. Formulas c = νλ c = speed of light (3.00 x 108m/s or 3.00X1010cm/s) ν = frequency (1/s, s-1, Hz) λ = wavelength (m, cm, nm(10-9)) λ = c/νν = c/λ Book problems

  8. Max Planck -found that energy of a body changes in small discrete units E = hν E = energy in joules (J) h = Planck’s constant = 6.6262 x 10 -34J∙s ν = frequency (1/s, s-1, Hz) v = E/h

  9. photons- particles of light photoelectric effect- metals emit electrons when light shines on them *especially the alkali metals -used in solar calculators

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