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

Answer:

The Formula for the energy of a single photon of a given wavelength is

so now we can write like this

the formula for the number of photons in the pulse is

so we can write

The Answer for A 193-nm-wavelength UV laser for eye surgery emits a 0.500 mJ pulse

is

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

**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 4.8×10^14