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Published byAlaina Harrington Modified over 4 years ago

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**Wavelength – λ – distance between successive points on a wave (crest to crest)**

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**Amplitude – vertical distance fro the midline of a wave to the peak or trough**

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**Frequency - ν – number of waves that pass a point in 1 second Hz = cycles per second**

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Speed of a wave u = λ ν Problem page 248 Calculate the frequency (in Hz) of a wave whose speed and wavelength are 713 m/s and 1.14 m, respectively.

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**Electromagnetic Spectra**

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**Electromagnetic Spectra**

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**Electromagnetic Spectra**

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**Electromagnetic Spectra**

Electromagnetic waves Travel at the speed of light = 3.00 x 108 m/s or 186,000 mi/s ν = c / λ

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Problem page 249 What is the wavelength (in meters) of an electromagnetic wave whose frequency is 3.64 x 107 Hz?

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**Planck’s quantum theory**

Quantum – the smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation. E = hν h = planck’s constant = 6.63 x J s

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**Planck’s quantum theory**

Energy is always emitted in multiples of hν… 2 hν…. 3 hν

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Photoelectric effect

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Problem page 252 The energy of a photon is 5.87 x What is its wavelength in nanometers?

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