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A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20.0ms in duration. The average power during each pulse is 0.6 W. then,A. the energy of each photon is `3.048xx10^(-19)J`B. the energy content in each pulse is 12mJC. the number of photons in each pulse is nearly `4xx10^(15)`D. the energy of each photon is nearly 1.9 eV |
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Answer» Correct Answer - A::B::C::D Energy of photon, `E_0=(hc)/(lamda)` `=(6.626xx10^(-34)xx3xx10^(8))/(652xx10^(-9))` `=3.048xx10^(-19)J=1.905eV` Energy content in each pulse is `0.6Wxx20xx10^(-3)s` `E_p=12xx10^(-3)J=12mJ` The number of photons in each pulse is `(E_p)/(E_0)=(12xx10^-3)/(3.048xx10^(-19))` `=3.9xx10^(16)approx4xx10^(16)` |
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