Gram Laser
using a laser beam in physics how do I calculate?
Using a laser beam, I melt 1 gram of ice. The frequency of the laser light is 5.1 x 1014 Hz. How many photons does my laser emit, assuming they are all absorbed by the ice?
2.5 x 1019 photons.
8.6 x 1019 photons.
1.0 x 1021 photons.
4.5 x 1021 photons.
The energy of 1 photon, E=hf, is
5.1 x 10^14 X 6.6 x 10^-34 = 3.4 x 10^-19 J
The latent heat of fusion of water is 334J/g, so you need 334J to melt the ice cube.
To provide 334J, you need 334/(3.4 x 10^-19) = 1.0 x 10^21.
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