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Aliya Jain 2B
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Joined: Wed Sep 11, 2019 12:16 am


Postby Aliya Jain 2B » Sun Oct 13, 2019 10:42 am

"A lamp rated at 32 W (1 W 5 1 J?s21) 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?" Can someone explain the initial step to figure this question out?

Trinity Vu 1D
Posts: 53
Joined: Fri Aug 30, 2019 12:15 am

Re: 1B.9

Postby Trinity Vu 1D » Sun Oct 13, 2019 10:51 am

By using the given wavelength, you can calculate the energy per photon (E=hv and c=vλ). Since the lamp is 32W which means 32 J/s, you know that in 2 seconds the lamp will generate 64 J. Divide 64J by the calculated energy per photon in order to find how many photons are emitted.

Posts: 100
Joined: Fri Sep 20, 2019 12:17 am

Re: 1B.9

Postby DarrenKim_3G » Sun Oct 13, 2019 10:52 am

A Watt is Joules per second. If you are given 32 Watts and a time interval of 2 seconds. 32 times 2 gives you the answer to part a

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