A 193-nm-wavelength UV laser for eye surgery emits a 0.500 mJ pulse. How many photons does the light pulse contain?

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Using the formula E = hc/λ

we can find out how much energy a single photon of wavelength 193 nm has.

E = Planck Constant * Speed of Light/193 nm

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**Explanation:**

The frequency of a wave is equal to:

where c is the speed of light, l is the wavelength of the wave. Replacing values:

The energy of the proton is:

where h is the Planck´s constant. Replacing

The number of photons is:

where E1 is the energy of the photon. Replacing:

**Answer:**

The number of photons is 4.8x10^14