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Unformatted text preview: Solution for Homework 20 Displacement Current and EM Waves - Due Monday After Exam Solution to Homework Problem 20.1(Relation between Components of Light Wave) Problem: Select the answer below that best describes the relationship between the electric field, magnetic field, and the direction of propagation of electromagnetic radiation. Select One of the Following: (a) All parallel. (b) Electric parallel to the direction of propagation but perpendicular to magnetic field. (c) Electric and magnetic parallel but perpendicular to the direction of propagation. (d-Answer) All perpendicular. Solution All perpendicular. Total Points for Problem: 3 Points Solution to Homework Problem 20.2(Speed of an AM radio wave) Problem: AM radio is a form of electromagnetic radiation with frequency of about 500kHz = 5 × 10 5 Hz . What is the speed of an AM radio wave in vacuum? Select One of the Following: (a-Answer) 3 × 10 8 m s (b) 2 . 25 × 10 8 m s (c) This cannot be determined unless the wavelength is also known. (d) Zero, radio waves can’t travel in vacuum. (e) Toby. Solution The speed of electromagnetic radiation, light, is 3 × 10 8 m s . Total Points for Problem: 3 Points Solution to Homework Problem 20.3(Three Polarizers) Problem: Unpolarized light with intensity 300 W m 2 is incident on three polarizers, P 1 , P 2 , and P 3 numbered in the order light reaches the polarizers. The transmission axis of P 1 and P 2 make an angle of 45 ◦ . The transmission axis of P 2 and P 3 make an angle of 30 ◦ . How much light is transmitted through P 3 ?...
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