Calculate the number of photon emitted in `10` hours by a `60 W` sodium lamp (`lambda` of photon `= 5893 Å)`

Explanation

Energy emitted by sodium lamp in `1s`
`= "Watt" xx "second" = 60 xx 1J`
Energy of photon emitted =` (hc)/(lambda)`
`= (6.626 xx 10^(-34) xx 3 xx 10^(8))/(5893 xx 10^(-19))`
`= 3.37 xx 10^(-19) J`
:. Number of photon emitted per second `= (60)/(3.37 xx 10^(-19))`
Number of photon emitted is `10` hour
`= 17.8 xx 10^(19) xx 10 xx 60 xx 60 = 6.41 xx 10^(24)`