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Physical Science Grade 10 www.learnxtra.co.za SESSION 6: ELECTROMAGNETIC RADIATION KEY CONCEPTS: In this session we will consider: - Properties of Light Wave-like nature of light Electromagnetic Spectrum Penetrating Ability of EM radiation Particle-like nature of EM radiation X-PLANATION Special Properties of light: Huge spectrum Speed limit Wave nature Particle nature No medium required Part of EM spectrum Wave-like nature of EM radiation Photon: A photon is a quantum (energy packet) of light Fields: Wave equation is still valid: Electromagnetic Spectrum Brought to you by Page 1 Physical Science Grade 10 www.learnxtra.co.za Penetrating ability of EM radiation: UV Radiation X-Rays Gamma Rays Cellphones and Microwave radiation Particle-like nature of EM Radiation: Planck’s Constant: Planck’s constant is a physical constant named after Max Planck. Energy of a photon: OR X-AMPLE QUESTIONS Question 1: Calculate the frequency of an EM wave with a wavelength of 400 nm. Question 2: What is the wavelength of a photon of light with a frequency of 101.3 kHz? Question 3: Give an example of the use of each type of EM radiation, i.e. gamma rays, X-rays, ultraviolet light, visible light, infrared, microwave and radio and TV waves. Question 4: Indicate the penetrating ability of the different kinds of EM radiation and relate it to energy of the radiation. Question 5: Explain why we need to protect ourselves from ultraviolet radiation from the Sun. Question 6: List some advantages and disadvantages of using X-rays. Question 7: What precautions should we take when using cell phones? Brought to you by Page 2 Physical Science Grade 10 www.learnxtra.co.za Question 8: How is the energy of a photon related to its frequency and wavelength? Question 9: What is the energy of a photon of EM radiation with a frequency of 3 x 108 Hz? Question 10: What is the energy of a photon of light with a wavelength of 532 nm and one with a frequency of 13 GHz and which has the longer wavelength? Brought to you by Page 3