# Calculating the total energy of photons from a helium-neon laser.

A helium-neon laser gives off red light with a wavelength of 632.8 nm (nanometers). What is the energy of the photons coming out of the laser?

(Hint: the speed of light is 3x10 [to the 8th pwr.] m/sec.)

SIDE NOTES:

We have been using very basic equations in this class, it is not advanced or anything. I do not know which equation(s) to use first of all or how to work it out. I need to show ALL work including formulas and steps, possibly drawings to. Thanks in advance!

#### Solution Preview

... uses a constant, called Planck's constant, which is called h and equals 6.6x10^(-34)Joules*seconds.

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<br>His equation that relates wavelength to energy ...