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Homework Help: Electromagnetic Radiation problems

  1. Nov 1, 2004 #1
    A celebrity holds a press conference, which is televised live. A television viewer hears the sound picked up by a microphone directly in front of the celebrity. This viewer is seated 2.1 m from the television set. A reporter at the press conference is located 4.1 m from the microphone and hears the words directly at the very same instant that the television viewer hears them. Using a value of 343 m/s for the speed of sound, determine the maximum distance between the television viewer and the celebrity.
  2. jcsd
  3. Nov 1, 2004 #2


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    (a) How long does it take sound to travel from the speaker to the reporter?

    (b) How long does it take sound to travel from the speaker on the viewer's television to the viewer?

    (c) How long does it take light to travel from the microphone to the speaker?

    BTW - it's not the distance from the speaker to the viewer. It's the distance the signal travels from one place to the other which may have to pass through several orbiting communications satellites and what not.
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