How many photons are produced in a laser pulse of 0.320 j at 641 nm?

The relationship between energy of a single photon and its wavelength can be determined using the formula E=hc/lambda where h is Planck's constant, c is the speed of light, and lambda is the wavelength in units of meters.  If we can find the energy of a single wavelength of 565 nm, we can then determine the number of photons that total 0.861 J.

Before we can solve for the energy, we need to convert 565...

your answer is c) plasma

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