Lesson: Electcromagnetic Spectrum (EMS)

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Presentation transcript:

Lesson: Electcromagnetic Spectrum (EMS)

Parts of a wave Wavelength – Distance between two corresponding points on successive waves. Amplitude – measure of a wave’s “strength” (height of crest or trough).

The Wave-like Electron The electron propagates through space as an energy wave. To understand the atom, one must understand the behavior of electromagnetic waves. Louis deBroglie

Electromagnetic Wave – An electric wave and magnetic wave moving at right angles to each other.

Electromagnetic Spectrum – Arrangement of all forms of electromagnetic radiation in order of frequency and wavelength. 5

low frequency = long wavelength high frequency = short wavelength Frequency (ν): number of wavelengths that pass a certain point in a given amount of time. - units are Hertz (Hz) If these 2 waves are traveling at equal speeds, which wave will have more wavelengths cross the finish line in one minute? low frequency = long wavelength FINISH high frequency = short wavelength

low frequency = long wavelength high frequency = short wavelength If these 2 waves are traveling at equal speeds, which wave will have more wavelengths cross the finish line in one minute? low frequency = long wavelength FINISH high frequency = short wavelength

Left Side Practice 1) Pick a type of wave on the EMS (not visible light). 2) Draw a pic of that wave and label the crest, trough, wavelength and amplitude. 3) Write and answer these questions: Does it have a greater wavelength than visible light? Does it have a higher frequency than visible light? Does it have more or less energy than visible light?

3) Write and answer these questions: Does it have a greater wavelength than visible light? Does it have a higher frequency than visible light? Does it have more or less energy than visible light?

Which has the greatest: Wavelength? Frequency? Energy? Warm Up 10/17 Which has the greatest: Wavelength? Frequency? Energy?

All waves on the EMS travel at the speed of light (c). c = speed of light = 3.00 x 108 m/s. c = λ x f Wavelength (λ) and frequency (f) are inversely related. c λ = f to solve for λ … c f = λ to solve for f …

Calculate the υ of a wave that has a wavelength of 5.00 x 10-6 m. Practice Calculate the υ of a wave that has a wavelength of 5.00 x 10-6 m. c ν = λ ν = = ν Hz Does this radiation have a shorter or longer λ than red light?

Practice What is the wavelength of radiation with a frequency of 1.50 x 1013 Hz? c λ = ν λ = λ =

On Your Own Practice Calculate the wavelength of yellow light emitted by a sodium lamp, if the frequency of the radiation is 5.10 x 1014 Hz. * Hint: Be sure you set up the right equation. Ask yourself: which variable am I solving for?

Create Your Own Problem Create a problem so that you have to solve for frequency (f). To do that, just make up a wavelength (between 10 and 10 . Solve it for yourself, then find one other person to solve it and check your work. Be sure to write your question as a word problem. 4 -12