A bulb is labelled as 150 watt, and only 8% of the energy is emitted as light of wave length 4500A0. The number of photons emitted by the bulb in one second is

1 watt = 1 J/sec150 watt = 150 J/sec only 8% of enery is emitted as lightenergy limitted    wave length of photon emitted = 4500 A0energy of each photon,                                     Total energy of all photons