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Wavelength, Frequency, & Energy of Light Byno Chemistry 2013.

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Presentation on theme: "Wavelength, Frequency, & Energy of Light Byno Chemistry 2013."— Presentation transcript:

1 Wavelength, Frequency, & Energy of Light Byno Chemistry 2013

2  Why does Aluminum not burn?  Why does Alcohol burn but it will not react with anything else?  Why does Aluminum react with Hydrochloric Acid?  Why does Calcium Carbonate react with vinegar, but it doesn’t burn? Discuss in your group

3  Identify and use the symbols for frequency and speed of light  Use 3x10 8 m/s as the value for the speed of light  Calculate E = hv using Planck’s constant  Calculate c = λv using the speed of light I can...

4 SymbolMeaningValue or Unit cSpeed of light3x10 8 m/s h Planck’s constant 6.63 x J  s EEnergyJoules (J) νfrequencyHertz (Hz) λwavelengthNanometer (nm) Symbols

5 Visible light breaks into a spectrum of colors depending on the wavelength of the light Visible Light

6 Spectroscope  A spectroscope is a device used to separate the colors of visible light and measure their wavelengths

7  Electrons exist in the electron cloud but they can be found in distinct ‘levels’  They are the s-orbital, p-orbital, d-orbital, and f-orbital  Electrons can jump up from one orbital to the next when energy is applied to the atom Electron Energy Levels

8 Ex. Cadmium

9 Groups 1 and 2, and Helium S-Orbital

10 Groups (except Helium) P-orbital

11 Transition metals – Groups 3-12 D-orbital

12 Lanthinide and Actinide series – Rare Earth Metals F-orbital

13 Electrons  The motion of electrons in the electron cloud of an atom creates low energy waves such as visible light and radio waves  The energy is the result of electrons hopping from one level up to the next  Energy is emitted when the electron falls back to the original level

14  An element can react with another element if it has electrons that can move  When a chemical substance reacts with another, the electrons move and give off energy in the form of light Reactivity

15  The energy of the electron’s movement in a chemical reaction can be calculated Wavelength Speed of light (m/s) Wavelength (m) Frequency (Hz) Example: A helium laser emits light with a wavelength of 633 nm. What is the frequency of the light?

16  Now that we know the wavelength, we can calculate the energy of the electron Energy (J) Frequency (Hz) h (Planck’s Constant) 6.63 x J  s Example: A helium laser emits light with a wavelength of 633 nm. What is the energy of its electrons? We previously calculated frequency = 6.00 Hz

17  What is the energy of light whose wavelength is 4.06 x m? Practice c÷λ = ν ν = 3.8x10 8 m/s ÷ 4.06x m ν = 7.39x10 18 Hz E = h × ν E = 6.63x J  s × 7.39x10 18 Hz E = 4.9x J


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