dessyj1
  • dessyj1
What are the units of the energy of a photon and the energy of light? I know light intensity is the number of photons that corresponds with the wavelength so from the information I would guess the unit would be number of waves per second.
Chemistry
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Energy of a photon=hv h=Planck constant. Its units are J*s or joules times seconds v=frequency. Its units are 1/s Energy of a light is energy of photon, since photon is a packet of light. Do you mean speed of light?
dessyj1
  • dessyj1
I understand now. I was never given the units to Planck's constant. I was just give a number.
anonymous
  • anonymous
The question is just asking for units Planck constant is 6.626 x 10^-24 J*s btw

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dessyj1
  • dessyj1
Yeah, i was not shown the j*s - i was only shown the number. So when i would do calculations with planck's number the units would not cancel completely because i did not know the j*s.
anonymous
  • anonymous
You do not need numbers to figure out the units. I give you explanation, but not the answer. (I know the answer) You can figure the answer by my info. Example problem: Velocity=distance/time Units of distance=m Time=s Velocities units would be m/s Just wondering if you can figure it out.
Photon336
  • Photon336
\[E = hv \] \[E = \frac{ hc }{ \lambda }\]
dessyj1
  • dessyj1
I understand what you are saying. I did not know the units for planck's constant so when I would try a practice problem like this one, it would go like this. What is the energy of a photon of green light with a 520nm wavelength? \[E _{p}= \frac{ hc }{ \lambda } \] \[E _{p}= (6.626x10^{-34})(2.998x10^{17}nm/s)(\frac{1}{ 520nm })\] so, at the end of the day I would be left with a unit of 1/s(which did not make sense to me) because I did not know the full mangitude of planck's.
anonymous
  • anonymous
Do you know the units for the energy of a photon now? If you do, then I can continue to solving problems with you.
dessyj1
  • dessyj1
Yes, it is in joules.
dessyj1
  • dessyj1
If I modified the question and said there were 10 photons in the wave, what would be the answer.
dessyj1
  • dessyj1
Are photons measured in mols?
anonymous
  • anonymous
You are right. It is in joules. Modify which question?
dessyj1
  • dessyj1
What is the overall energy of green light with a 520nm wavelength that contains 10 photons?
anonymous
  • anonymous
You would multiply it by 10 since ten more photons means then more energy. E=hv/wavelength only applies to one photon
anonymous
  • anonymous
ten more energy*
dessyj1
  • dessyj1
would the units still be just joules?
anonymous
  • anonymous
Yes. Lets say a photon has an energy of 500J 10(500J)=5000J
dessyj1
  • dessyj1
Okay. Thank you!
dessyj1
  • dessyj1
How would you measure photons?
dessyj1
  • dessyj1
Or is it very discrete?

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