Do Now: 1.If you could solve one problem using science, what would it be? 2.What branch of science do you think you would need to use to solve the problem?

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Presentation transcript:

Do Now: 1.If you could solve one problem using science, what would it be? 2.What branch of science do you think you would need to use to solve the problem? 3.Who do you think is working on this problem now?

YWBAT Explain what causes atomic emission spectra. Explain how the frequencies of emitted light are related to changes in electron energies.

Light as a Wave By 1900’s, experimental evidence convinced scientists that light consisted of waves. Amplitude – wave’s height from zero to crest Wavelength (λ) – distance between crests Frequency ( ⋎ ) – number of wave cycles to pass a given point per time (SI unit of cycles/sec are Hertz (Hz))

Light as a Wave The frequency ( ⋎ ) and wavelength (λ) of light are inversely proportional to each other – As wavelength increases, frequency decreases – As wavelength decreases, frequency increases

Light as a Wave Speed of Light = wavelength x frequency c = λ x ⋎ c = x 10 8 m/s

Nature of Light According to the wave model, light consists of electromagnetic waves Electromagnetic radiation includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, x-rays, and gamma rays. All electromagnetic waves travel in a vacuum at a speed of * 10 8 m/s

Nature of Light When sunlight passes through a prism, different wavelengths can be separated into a spectrum of colors. – Red has the longest wavelength (lowest frequency) – Violet has the shortest wavelength(highest frequency)

Electromagnetic Spectrum

Chemistry of Fireworks

Atomic Emission Spectra When atoms absorb energy, their electrons move to higher energy levels. These electrons lose energy by emitting light when they return to lower energy levels. No two elements have the same emission spectrum.

Quantum The amount of radiant energy (E) of a single quantum absorbed or emitted by a body is proportional to the frequency of radiation. E = h ⋎ h = Plank’s Constant = x J·s

Photoelectric Effect In the photoelectric effect, electrons are ejected when light of sufficient frequency shines on a metal Light quanta are called photons Energy of a photon = E = h x ⋎