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jennilalala
Group Title
Calculate the energy in J of 0.32 moles of photons whose frequency is 2.6 x 10^15 ?
 2 years ago
 2 years ago
jennilalala Group Title
Calculate the energy in J of 0.32 moles of photons whose frequency is 2.6 x 10^15 ?
 2 years ago
 2 years ago

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SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
You must know the formula for calculating the energy... in this situation. Do you know the formula?
 2 years ago

aaronq Group TitleBest ResponseYou've already chosen the best response.1
E=hv h is planks constant v= frequency this gives you the energy of 1 photon so multiply this by the amount of photons you have: amount of photons = avogadros constant x number of moles
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
that v is actually "new (pronounced as new)"
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
So @jennilalala with the help of : E = hv formula, can you find the energy by putting the values given ?
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
"v" > \(\large{\color{blue}{\nu}}\) .... right @aaronq ?
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
I am back sorry ahaah. yes i know the formulas. i just dont know what to do if it says ".32 moles of photon.."
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
Do you the planck's constant ?
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
6.626x10^23 ?? not by heart...yet...
 2 years ago

aaronq Group TitleBest ResponseYou've already chosen the best response.1
haha yep, v= "new"
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
OK so it is \[\large { h = 6.626 \times 10^{34} m^{1}}\]
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
oh wait it is m^2 kg/s
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
So right, now solve this : \[\large{E = 6.626 \times 10^{34} \times 2.6 \times 10^{15}}\] What do you get?
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
1.73x10^18
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
My calculator says it as : \(\large{\color{blue}{ 17.2276 * 10^{19}}}\) that is 1.72276 * 10^{18}
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
OK so now .. this is the energy for \(1\) photon ... now we to calculate for 0.32 moles of photons.
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
See ... no. of photons = Avogadros's constant * no. of moles of photons...
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
You know avogadro's constant?
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
6.022x10^23
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
Good! So now, solve this one : \[\large{\color{red}{\mathbb{No. of Photons}} = \color{blue}{6.022 * {10}^{23}} \times \color{green}{0.32}}\]
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
1.93x10^23
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
then i multiply the two calculations?
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
Correct! So this is your No. of photons. Now multiply this result with "1.73 * 10^{18} "
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
3.3x10^5
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
Right!
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
not negative typo lol
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
No problem.
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
So finally you have your correct way, I hope you got it ?
 2 years ago

jennilalala Group TitleBest ResponseYou've already chosen the best response.0
Yes thank you so much!
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.2
You're welcome @jennilalala . keep up the good work.
 2 years ago
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