Energy and photonsEnergy and photonsWEach photon carries a small amount of energy with itWThe amount of energy depends on the frequencyE = hν, where h= 6.63×10-34J sLow frequency, low energy, high frequency, high energyCan also relate wavelengthλ=hcE
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WTotal energy = energy per photon ×number of photonsWE = nephoton= nhνWExampleA cash register scanning laser operates at a wavelength of 655 nm and produces about 3×1015photons per second. How much energy does the laser emit each second?mJmsmJssphotons9.010655/1031063.6/103983415=××××××−−