Electromagnetic Spectrum

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Presentation transcript:

Electromagnetic Spectrum Electrons in Atoms Electromagnetic Spectrum

How does energy travel? It travels through space as electromagnetic radiation Electromagnetic Radiation Is energy that exhibits wavelike behavior and travels through space at the speed of light in a vacuum.

Parts of a WAVE Crest Trough Crest – highest point of a wave Trough – lowest point of a wave

How a WAVE travels A wave travels through space according to three characteristics: Wavelength Frequency Speed of Light

How a WAVE travels Wavelength- Represented by lambda (l) Is the distance between two troughs or two crests

How a WAVE travels Frequency- Represented by f Is the number of waves that pass a given point in one second Units of Hertz (Hz) or s-1

How a WAVE travels Speed of Light- Represented by c

Wavelength and Frequency Relationship Wavelength l (Long or Small) Frequency f (fast or slow) Trial A Trial B As l increases the f ___________________________ As l decreases the f __________________________

Types of Electromagnetic Radiation

Also known as the Continuous Spectrum How can we remember the continuous spectrum? R O Y G B I V

How do we see colors? Electrons are excited and jump up to a higher energy level When they are come back down to their ground state they emit the color we see

How does it prove the photoelectric effect? Einstein said that electromagnetic radiation has both wavelike and particle like natures It can behave as a wave or as a stream of tiny particles called photons Photon – No mass Carries a quantum of energy These photons carry enough energy to release an electron from an atom of a metal

Ephoton = hf Definition Where do we find it? Units Ephoton Energy We calculate it Joules (J) h Planck’s Constant On reference material J • s f frequency s-1 or Hz

Practice with Ephoton = hf A radio wave has a frequency of 3.80 x 1010 Hz. What is the energy of one photon of this radiation? Ephoton = h = f = Formula:

Practice with Ephoton = hf In microwave radiation a photon has an energy of 8.34 x 10-24J. What is the frequency of this photon? Ephoton = h = f = Formula: