Energy and Radiation. ATS 150 Spring 2014 Lecture 3. Defining Energy is Hard!. “ Energy is the capacity to perform work ” (but physicists have a special definition for “ work, ” too!)By dusan
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Module 1 Electric Current. Electrons, Photons & Waves. Explain that electric current is a net flow of charged particles. Explain that electric current in a metal is due to the movement of electrons, whereas in an electrolyte the current is due to the movement of ions.
Unit G482: Electrons, Waves and Photons. Module 1: Electric current • 2.1.1 Electric current Module 2: Resistance • 2.2.1 Circuit symbols • 2.2.2 E.m.f . and p.d . • 2.2.3 Resistance • 2.2.4 Resistivity • 2.2.5 Power Module 3: DC circuits
Waves, Photons & the EM Spectrum. Astronomers obtain information about the universe mainly via analysis of electromagnetic ( em ) radiation : visible light radio waves x-rays infrared radiation and so on . . . EM radiation sometimes behaves like waves ,
Waves, Photons and Medical Physics AS Module 2. 2.1 Waves 2.2 Refraction 2.4 Superposition and Interference 2.5 Diffraction 2.6 Sound. 2.4 Superposition and Interference. You need to be able to:
Chapter 38 Photons: Light Waves Behaving as Particles. February 22 Photoelectric effect 38.1 Light absorbed as photons: the photoelectric effect Photoelectric effect: When light is incident on certain metallic surfaces, electrons are emitted .
photons. Physics 100 Chapt 21. Photoelectric effect. cathode. anode. Vacuum tube. Photoelectric effect. Vacuum tube. Experimental results. Electron KE ( electron Volts). For light freq below f 0 , no electrons leave the cathode. f 0. Even if the light Is very intense.
Photons. Particle Physics Lesson 3. Learning Objectives. To know what a photon is. To know how to calculate the energy of a photon. To be able to calculate how many photons are emitted by a light source every second. Electromagnetic Spectrum. Electromagnetic Spectrum. Mnemonic?.