A sodium-vapor light has a power output of
9.3 W.
Using 589.3 nm as the average wavelength
of the source, calculate the number of pho-
tons emitted per second. Planck

Expert Answer

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Power is measured in Watts (W), which is the same as Joules per second (J/s), i.e. the rate of energy loss/emission by the object. The energy of a photon of light is given by E = hf where h is Planck's constant and f is the f... view the full answer

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