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Worksheet: Radiation Pressure

Q1:

A 150-W lightbulb emits of its energy as electromagnetic radiation. The bulb is at the center of a perfectly light absorbing sphere of radius 10.00 m. What is the radiation pressure on the sphere’s interior?

  • A N/m2
  • B N/m2
  • C N/m2
  • D N/m2
  • E N/m2

Q2:

A microscopic spherical dust particle of radius 2.000 μm and mass 10.0 µg is moves in outer space at a constant speed of 30.0 cm/s. A wave of light strikes the particle from the opposite direction to the direction of the particle’s motion and this light is absorbed. The particle decelerates uniformly to rest in a time of 1.00 s. What was the average electric field amplitude of the absorbed light?

  • A V/m
  • B V/m
  • C V/m
  • D V/m
  • E V/m

Q3:

Electromagnetic radiation from a 5.00-mW laser is concentrated into a 1.00-mm2-area beam.

What is the radiation intensity of the beam?

  • A W/m2
  • B W/m2
  • C W/m2
  • D W/m2
  • E W/m2

What is the maximum electric force that the beam can exert on a 2.00-nC electric charge?

  • A N
  • B N
  • C N
  • D N
  • E N

What is the maximum magnetic force that the beam can exert on a 2.00-nC charge that has a speed of 400 m/s?

  • A N
  • B N
  • C N
  • D N
  • E N

Q4:

Sunlight falls perpendicularly on a kite with a reflecting surface of area 0.75 m2. The average intensity of the sunlight is 900 W/m2.

What is the average force on the kite due to radiation pressure?

  • A N
  • B N
  • C N
  • D N
  • E N

If the kite material is black and absorbs all sunlight, what is the average force on the kite due to radiation pressure?

  • A N
  • B N
  • C N
  • D N
  • E N