Energy: EM transfer I can evaluate the energy transferred by light waves based the frequency and wavelength of the light wave.

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Presentation transcript:

Energy: EM transfer I can evaluate the energy transferred by light waves based the frequency and wavelength of the light wave.

Electromagnetic Spectrum All waves on the EM spectrum are light waves. The speed of light is a constant (like Earth’s gravitational field strength) 𝑐=2.99 𝑥 10 8 𝑚 𝑠 c = 300,000,000 m/s

Electromagnetic Spectrum All waves on the EM spectrum are light waves. The speed of light is a constant (like Earth’s gravitational field strength) 𝑐=2.99 𝑥 10 8 𝑚 𝑠 All light waves travel at the speed of light so all EM waves travel at the same speed. Light waves have different wavelengths. Radio waves are light waves with LONG wavelengths. Gamma waves (radioactive beta particles) are are light waves with SHORT wavelengths.

Wave forms Crests - peaks troughs - valleys

Wavelengths are measured in meters. Wave forms Units: Wavelengths are measured in meters. Wavelength : same spot on the wave to the same spot on the next wave. Wavelength Symbol: 𝝀 Lower case Greek letter, lambda

Wave forms Amplitude : the wave height. Measured from the midline.

Wave frequency Frequency : how many times a full wavelength passes a given point in specified period of time(usually a second) . Units: Frequency is measured in hertz. A hertz is one cycle per second.

Wavelength and frequency Short wavelength High frequency High Energy Long wavelength Low frequency Low Energy

Visible Light ROY G. BIV Red Orange Yellow Green Blue Indigo Violet

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Radio waves The call number of a radio station is its broadcast frequency in megahertz. In general, Broadcast radio waves are between 3 and 300 MegaHertz.

Wave forms Frequency : how many times a full wavelength passes a given point in specified period of time(usually a second) . When wavelength increases, frequency decreases. When wavelength decreases, frequency increases.

Electromagnetic Spectrum: Relationship between wavelength( 𝝀) and frequency(f) When wavelength increases, frequency decreases. When wavelength decreases, frequency increases.

Electromagnetic Spectrum: Relationship between wavelength( 𝝀) and frequency(f) When wavelength( 𝜆) decreases, frequency( f ) must increase since the product remains constant at 300,000,000 m/s. 𝝀 f

Electromagnetic Spectrum: Relationship between energy (E) and frequency ( f ) 𝑬 f

Energy: EM transfer I can evaluate the energy transferred by light waves based the frequency and wavelength of the light wave.