## Quantum World - Light

$c=\lambda v$

yasminea 3L
Posts: 10
Joined: Wed Sep 21, 2016 2:56 pm

### Quantum World - Light

A lamp rated at 40. W emits blue light at wavelength 470 nm. How many photons of blue light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?

Jiaruo Wang 1K
Posts: 7
Joined: Wed Sep 21, 2016 3:00 pm

### Re: Quantum World - Light

Etotal=W=p*t=40w*2.0s=80J
Ephoton=hc/λ
number of photon=Etotal/Ephoton
n(amount in mole)=number of photon/Avogado's constant