lecture17 101026 - ElectroMagnetic Spectrum Quick Quiz: Why...

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1 ElectroMagnetic Spectrum Quick Quiz: Why do we use infrared waves and not X-rays to heat our homes? A. X-ray wavelengths are too short B. X-ray wavelengths are too long C. We use microwaves to heat our homes D. Physical law says that X- rays can only be used for medicine Photoelectric Effect When light is incident on certain metallic surfaces, electrons are emitted from the surface The effect was first discovered by Hertz The successful explanation of the effect was given by Einstein in 1905 For what did Einstein receive the Nobel Prize in 1921? a. Theory of Special Relativity b. Theory of General Relativity c. Theory of Quantum Gravity d. Theory of the photoelectric effect e. Einstein never received the Nobel Prize Discovery: Heinrich Hertz Hertz clarified Maxwell s electromagnetic theory of light: Proved that electricity can be transmitted in electromagnetic waves. Established that light was a form of electromagnetic radiation. First person to broadcast and receive these waves. Back in 1887…
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lecture17 101026 - ElectroMagnetic Spectrum Quick Quiz: Why...

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