Physics Practice Problems Energy Carried by Electromagnetic Waves Practice Problems Solution: A laser beam has a wavelength of 633 nm and a powe...

🤓 Based on our data, we think this question is relevant for Professor Fomin's class at UT.

Solution: A laser beam has a wavelength of 633 nm and a power of 0.500 mW spread uniformly over a circle 1.20 mm in diameter. This beam falls perpendicularly on a perfectly reflecting piece of paper having twice the diameter of the laser beam and a mass of 1.50 mg. What are the amplitudes of the electric and magnetic fields in this laser beam?

Problem

A laser beam has a wavelength of 633 nm and a power of 0.500 mW spread uniformly over a circle 1.20 mm in diameter. This beam falls perpendicularly on a perfectly reflecting piece of paper having twice the diameter of the laser beam and a mass of 1.50 mg. What are the amplitudes of the electric and magnetic fields in this laser beam?