unit conversion hw Q 1.3

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juliefilice 4A
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Joined: Fri Sep 28, 2018 12:27 am

unit conversion hw Q 1.3

Postby juliefilice 4A » Thu Oct 25, 2018 5:38 pm

The question reads, "In each second, a certain lamp produces 2.4x10^21 photons with a wavelength of 633 nm. How much power (in watts) is produced as radiation at this wavelength?"
I know how to solve this problem and that you start using E=hc/lambda, but do I need to convert the wavelength to m? How do I know when to convert to SI base units before starting a problem?

Shash Khemka 1K
Posts: 38
Joined: Fri Sep 28, 2018 12:18 am

Re: unit conversion hw Q 1.3

Postby Shash Khemka 1K » Thu Oct 25, 2018 5:50 pm

You should generally always convert wavelength into meters when substituting into an equation. Just remember to put your answer back into the form that the question is asking for. Hope this helps!

Posts: 63
Joined: Fri Sep 28, 2018 12:28 am

Re: unit conversion hw Q 1.3

Postby MichelleRamirez_2F » Thu Oct 25, 2018 6:35 pm

You should convert the given values to the required SI units before plugging them into the equation you are using (like e=hv etc) that way when you are solving the problem you are able to "cross out" the units that you don't need in your final answer. At the end, if they are asking for a certain SI unit you convert the solution you got to those units.

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