1A.9 Energy of Photon


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Ying Yan 1F
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Joined: Fri Aug 02, 2019 12:16 am

1A.9 Energy of Photon

Postby Ying Yan 1F » Thu Oct 17, 2019 9:55 pm

On question 1A.9 I understand that the key equation is C=(wavelength)(frequency), however the question also asks for the energy of photon, how do I calculate for that? Thank you!

Claire Lo 3C
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Joined: Sat Aug 17, 2019 12:18 am

Re: 1A.9 Energy of Photon

Postby Claire Lo 3C » Thu Oct 17, 2019 9:56 pm

E = hv

So after u calculate v from c=wavelength x frequency, u plug it into E=hv with h as Planck's constant

MMckinney_4H
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Re: 1A.9 Energy of Photon

Postby MMckinney_4H » Fri Oct 18, 2019 10:18 am

The formula (Planck's Constant)(frequency)= (Energy) would be able to help you if you know the frequency. If not, use the formula (wavelength)(frequency)=(speed of light) then substitute.

AniP_2D
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Re: 1A.9 Energy of Photon

Postby AniP_2D » Fri Oct 18, 2019 10:29 am

You would use Energy=(Planck's constant)*(frequency) to find the energy of the photon. If you do not have the value of frequency, you would use speed of light=(wavelength)*(frequency) to find frequency and then plug it into the equation for energy.

Juana Abana 1G
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Re: 1A.9 Energy of Photon

Postby Juana Abana 1G » Sat Oct 19, 2019 4:45 pm

You would use the equation: E = hv

Shutong Hou_1F
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Re: 1A.9 Energy of Photon

Postby Shutong Hou_1F » Sat Oct 19, 2019 11:27 pm

In finding the energy of photons, we generally consider E = (Plank's constant) * (frequency) as the key equation. However, the equation c = (wavelength) * (frequency) is also important in a way that sometimes we only know the wavelength, rather than the expected frequency of photons. By utilizing E = (Plank's constant) * (frequency) and c = (wavelength) * (frequency) and substitution, we could derive that E = (Plank's constant) * (c) / (wavelength).

504939134
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Joined: Wed Sep 18, 2019 12:21 am

Re: 1A.9 Energy of Photon

Postby 504939134 » Sat Oct 19, 2019 11:39 pm

After you find the wavelength of the radiation, you then find the energy by using E=h*v, which is Plancks constant 6.626x10^-34J times frequency which is given. Hope this helps!

Leyna Dang 2H
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Re: 1A.9 Energy of Photon

Postby Leyna Dang 2H » Sun Oct 20, 2019 11:56 am

You can try to solve for the frequency and once you get that, use the formula E= (Plank's constant)*(frequency), or E=hv, in order to get the energy of the photon. If you are given the wavelength and not the frequency, you could use wavelength to find the frequency by using formula v (frequency) = speed of light (2.998*10^8m.s^-1) / wavelength and plug it into E=hv.

Andrea_Torres
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Re: 1A.9 Energy of Photon

Postby Andrea_Torres » Sun Oct 20, 2019 12:20 pm

To calculate for the energy you use the equation E=hv, h being Planck's constant.

JasonKwon_3k
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Joined: Thu Jul 11, 2019 12:16 am

Re: 1A.9 Energy of Photon

Postby JasonKwon_3k » Sun Oct 20, 2019 12:25 pm

The energy of an individual photon can be calculated by the equation E=hv, with h being Planck's constant. By calculating "E", you calculate the energy of ONE photon, that can be transfered.

Claire Stoecklein 1E
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Re: 1A.9 Energy of Photon

Postby Claire Stoecklein 1E » Sun Oct 20, 2019 2:23 pm

Some questions (it may even be the one in contention) ask for the the energy of a mole of photons, in which case you would then multiply Plancks constant by Avogadros number.

Cynthia Rodas 4H
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Re: 1A.9 Energy of Photon

Postby Cynthia Rodas 4H » Sun Oct 20, 2019 8:31 pm

This problem in particular requires the use of two equations:
c= (wavelength)(frequency)
E = hv

E represents the energy of a photon
h represents Planck's constant (6.626 x 10[/sup]-34[/sup] J * s)
v represents the frequency of radiation

Since the first and third parts of the problem provide you with the frequency, you can just plug it into E= hv to get the energy of the photon.
For the fourth part, you would simply find the frequency using c= (wavelength)(frequency) and then plug the frequency into the energy equation.

Amanda Ung 4D
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Joined: Thu Jul 25, 2019 12:17 am

Re: 1A.9 Energy of Photon

Postby Amanda Ung 4D » Sun Oct 20, 2019 8:54 pm

E = hv --> E is the energy of the photon and you get it by multiplying Planck's constant (h) and the frequency (v)


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