Calculate Number of Photons Released in Laser Surgery

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SUMMARY

The discussion focuses on calculating the number of photons released during laser surgery using a laser with a wavelength of 514 nm and a power of 1.9 W over a duration of 0.052 seconds. The total energy released by the laser is determined by multiplying the power by the time, yielding 0.0988 joules. The energy of each photon is calculated using the formula E = hc/λ, where h is Planck's constant and c is the speed of light. This results in an energy of approximately 3.86 x 10-19 joules per photon, leading to a total photon count of approximately 2.56 x 1014 photons.

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  • Familiarity with Planck's constant and the speed of light
  • Knowledge of the relationship between power, energy, and time
  • Basic concepts of photon energy and wavelength
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Medical professionals, physicists, and engineers involved in laser technology and its applications in surgery will benefit from this discussion.

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Lasers are now used in eye surgery. Given that the wavelength of a certain laser is 514 nm and the power of the laser is 1.9 W, how many photons are released if the laser is used for 0.052 s during the surgery?

HELP: You know the energy released per second (the power) and the time the laser is on - from this you can calculate the total energy released.

HELP: You also know the wavelength of each photon and can therefore calculate the energy of each photon. Knowing the total energy and the energy of each individual photon leads you to the number of photons!
 
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