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Chapter 33: Electromagnetic Waves

Fundamentals Of Physics
Pages: 972 - 1009

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122 Questions for Chapter 33: Electromagnetic Waves

  1. The intensity Iof light from an isotropic point source is determined as a function of distance r from the source. The Figure gives intensity I versus the inverse square of that square r-2. The vertical axis scale is set by Is=200 w/m2, and the horizontal axis scale is set by rs-2 = 8.0 m-2. What is the power of the source?

    Found on Page 1002
  2. High-power lasers are used to compress a plasma (a gas of charged particles) by radiation pressure. A laser generating radiation pulses with peak power 1.5×103MWis focused onto 1.00 mm2 of high-electron-density plasma. Find the pressure exerted on the plasma if the plasma reflects all the light beams directly back along their paths.

    Found on Page 1002
  3. A black, totally absorbing piece of cardboard of area A = 2.0cm2intercepts light with an intensity of110W/m2 from a camera strobe light. What radiation pressure is produced on the cardboard by the light?

    Found on Page 1002
  4. Someone plans to float a small, totally absorbing sphere 0.500m above an isotropic point source of light so that the upward radiation force from the light matches the downward gravitational force on the sphere. The sphere’s density is 19.0 g/cm3, and its radius is 2.00mm. (a) What power would be required of the light source? (b) Even if such a source were made, why would the support of the sphere be unstable?

    Found on Page 1002
  5. It has been proposed that a spaceship might be propelled in the solar system by radiation pressure, using a large sail made of foil. How large must the surface area of the sail be if the radiation force is to be equal in magnitude to the Sun’s gravitational attraction? Assume that the mass of the ship + sail is 1500 kg, that the sail is perfectly reflecting, and that the sail is oriented perpendicular to the Sun’s rays. See Appendix C for needed data. (With a larger sail, the ship is continuously driven away from the Sun.)

    Found on Page 1002
  6. In Fig.33-38, a laser beam of power 4.60W and diameter d=2.60mm is directed upward at one circular face (of diameter d<2.60mm) of a perfectly reflecting cylinder. The cylinder is levitated because the upward radiation force matches the downward gravitational force. If the cylinder’s density is 1.20 g/cm3, what is its height H?

    Found on Page 1002
  7. Question: The average intensity of the solar radiation that strikes normally on a surface just outside Earth’s atmosphere is 1.4kw/m2.(a) What radiation pressure Pr is exerted on this surface, assuming complete absorption?(b) For comparison, find the ratio of Pr to Earth’s sea-level atmospheric pressure, which is1.0×105 Pa

    Found on Page 1002
  8. A small spaceship with a mass of only1.5×103kg (including an astronaut) is drifting in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 10kw laser beam, what speed will the ship attain in 1.0 day because of the momentum carried away by the beam.

    Found on Page 1002
  9. In Fig. 33-75, unpolarized light is sent into a system of three polarizing sheets, where the polarizing directions of the first and second sheets are atanglesθ1=20°andθ2=40°. What fraction of the initial light intensity emerges from the system?

    Found on Page 1009
  10. In Fig. 33-76, unpolarized light is sent into a system of three polarizing sheets with polarizing directions at angles, θ1=20°, θ2=60°andθ3=40°.What fraction of the initial light intensity emerges from the

    Found on Page 1009

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