photoelectric emission

[winnie101]

could someone plz help me with the following
A particular filament rating of 60W emits 5% of this power as visible light. The average wavelength of visible light is 550nm.
Calculate the number of photons of visible light emitted per second from the lamp.
Thanks

[Deadly_king]

could someone plz help me with the following
A particular filament rating of 60W emits 5% of this power as visible light. The average wavelength of visible light is 550nm.
Calculate the number of photons of visible light emitted per second from the lamp.
Thanks

The 5% power is defined as the energy required for number of photons to be emitted per second.

Hence Power = x where = photon energy =  /lambda

Power = x /lambda -----> 5/100 x 60 = x (6.63 x 10^-34) x (3 x 10⁸) / (550 x 10^-9)

Thus is found to be 8.3 x 10¹⁸ which is the required answer.

Sorry for late reply...........but I was kinda busy.

[winnie101]

thank u so much

[Deadly_king]

thank u so much

Anytime