## 1b.

$c=\lambda v$

Jessica Tejero 3L
Posts: 54
Joined: Wed Sep 25, 2019 12:16 am

### 1b.

Can someone help

1B.9 A lamp rated at 32 W emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?

Jesse Anderson-Ramirez 3I
Posts: 54
Joined: Thu Sep 26, 2019 12:18 am

### Re: 1b.

energy from the lamp = 32 J/s * 2s = 64J. Also 420nm should be converted to m (420 x 10^-9). Use the equation: E=hc/wavelength which gives you 4.73 x 10^-19 J per photon. Then 64/4.73 x 10^-19 gives you 1.4 x 10^20 J.