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I'm really stuck on the following questions and so any help would be really appeciated.

**(a) A laser produces light of wavelength 632nm. Calculate the energy of the laser photons.**

Speed = Wavelength x Frequency

3 x 108 = 632 x 10^-9 x f

f = 4.75 x 10^14 Hz

E = hf

E = 6.6 x 10^-34 x 4.75 x 10^14

__E = 3.14 x 10^-19 J__

**(b) The laser has a power output of 100Mw. Calculate the number of photons released each second.**

Thank you.

Cathy