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Science Standard S8P5: Students will explore the wave nature of sound and electromagnetic radiation.
Essential Question What are some everyday uses of electromagnetic radiation (or waves)?
Waves… a review • Most waves are either longitudinal or transverse. • Sound waves are longitudinal. • But all electromagnetic waves are transverse…
Electromagnetic waves • Produced by the movement of electrically charged particles • Can travel in a “vacuum” (they do NOT need a medium)
Electromagnetic waves • Travel at the speed of light (300,000,000 m/s in a vacuum ) * Travels slower when passing through a medium • Also known as EM waves because they are surrounded by: i.Electricfields ii.Magneticfields
Wave-particle Duality • Light can behave like a wave or like a particle • Travels in bundles of energy • Bundles act like small particles • A “particle” of light is called a photon
Wave-particle Duality • All electromagnetic waves travel at the same speed • Frequency and wavelength are used to classify the waves in the electromagnetic spectrum
ElectromagneticSpectrum • The electromagnetic spectrum is the complete range of electromagnetic waves placed in order of increasing frequency.
ElectromagneticSpectrum • As the frequency increases: a.Wavelengthdecreases b.Photonpenetrating energy increases
Radio waves • Longest wavelength EM waves Low Frequency & Lowest Photon Energy • Uses: • TV broadcasting • AM and FM broadcast radio • Avalanche beacons • Heart rate monitors • Cell phone communication
Microwaves • Wavelengths from 1 mm- 1 m • Uses: • Microwave ovens • Bluetooth headsets • Broadband Wireless Internet • Radar • GPS
Infrared Radiation • Wavelengths in between microwaves and visible light • Uses: • Night vision goggles • Remote controls • Thermal Energy Transfer • Heat-seeking missiles
Visible light • Only type of EM wave able to be detected by the human eye • Violet is the highest frequency light • Red light is the lowest frequency light • Only EM we can see
Ultraviolet • Shorter wavelengths & higher frequency than visible light • Uses: • Black lights • Sterilizing medical equipment • Water disinfection • Produces vitamin D in human skin • Security images on money
X-rays • Tiny wavelength, high energy waves– greater penetrating power • Uses: • Medical imaging • Airport security • Inspecting industrial welds
Gamma Rays • Smallest wavelengths, highest energy EM waves • Uses • Food irradiation • Cancer treatment • Treating wood flooring
Wrap It Up • What produces electromagnetic radiation? • What type of wave is electromagnetic radiation?
Wrap It Up • Name a wave that can travel faster than electromagnetic radiation? • What is a photon? • Name the longest electromagnetic wave.