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Chapter 23: Electromagnetic Radiation

Matter & Interactions
Pages: 939 - 992

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25 Questions for Chapter 23: Electromagnetic Radiation

  1. You may have noticed that television antennas onhousetops have metal rods mounted horizontally (Figure 23.112),at least in the United States (we're not talking about satellitedishes). What does this imply about the construction of thetransmitting antennas used by television stations? Why?

    Found on Page 987
  2. Television antennas often have one or more horizontalmetal bars mounted behind the receiving antenna and insulated from it, as shown in Figure 23.113. Explain qualitatively whyadding a second metal bar can make the television signal either stronger or weaker, depending on the distance between the front receiving antenna and the second bar.

    Found on Page 987
  3. At dawn, with the Sun just rising in the east, you facethe Sun and bend your head back to look straight up, and youexamine the blue sky light with a Polaroid® filter. Why is the lightpolarized? What is the direction of the electric field, east—west ornorth—south? Explain carefully

    Found on Page 987
  4. On a cloudless day, when you look away from the Sun atthe rest of the sky, the sky is bright and you cannot seethe stars,On the Moon, however, the sky is dark and you cansee the stars even when the Sun is visible. Explain briefly.

    Found on Page 988
  5. If a beam of light from a medium with a higher indexof refraction emerges into a medium with a lower index ofrefraction, what happens? (1) The emerging beam bends towardthe normal (smaller angle). (2) The emerging beam bends away from the normal (larger angle). (3) The emerging beam does notbend at all.

    Found on Page 988
  6. If the magnetic field in a particular pulse has a magnitude of 1x10-5T (comparable to the Earth's magnetic field). What is the magnitude of the associated electric field?

    Found on Page 988
  7. In Figure 23.116 electromagnetic radiation is moving to the right, and at this time and place the electric field is horizontal and points out of the page. The magnitude of the electric field is E=3000 N/C. What are the magnitude and direction of the associated magnetic field at this time and place?

    Found on Page 988
  8. A pulse of radiation propagates with velocity <0,0,-c>. The electric field in the pulse is <7.2×106,0,0>N/C. What is the magnetic field in the pulse?

    Found on Page 988
  9. An electric field of 1×106N/C acts on an electron, resulting in an acceleration of 1.8×1017m/s2 for a short time. What is the magnitude of the radiative electric field observed at a location a distance of 2cm away along a line perpendicular to the direction of the acceleration?

    Found on Page 988
  10. A proton is accelerated in the direction shown by the arrow labeled \(\vec a\) in Figure 23.118. Which of the arrows labeled A–F correctly shows the direction of the vector \({\vec a_ \bot }\)at the observation location indicated by the vector \(\vec r\)

    Found on Page 989

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