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Energy of photons of given frequency and number

Storing kinetic energy in bondsDoes minimizing ANY type of energy ALWAYS predict a state of equilibrium?Energy of photonComputing accurate vibrational and rotational contributions to the free energy of transition states and loosely bound complexes“Exactly Equal” and “At Least” in electron excitationFinding the activation energy, when the relation between rate constant and absolute temperature is givenCalculate activation energy of intermolecular displacement on a nano particleEstimation of pressure and kinetic energy density of stellar interior using kinetic theory of gasesEnergy absorbed by the gas from a PV-diagramSolve for wavelength of photon given threshold frequency

5

$begingroup$

I’m having trouble with calculating the energy of $pu5.00e10$ photons of frequency $pu1.00e9 s-1$.

I know that to calculate the energy $E = hf$ is to be used. However, I am unaware as to what to do with the $pu5.00e10$ value and its meaning.

physical-chemistry energy

share|improve this question

edited Mar 17 at 11:24

andselisk

18.6k657122

asked Mar 17 at 11:06

Huda AlnusairiHuda Alnusairi

383

$endgroup$

add a comment | 

5

$begingroup$

I’m having trouble with calculating the energy of $pu5.00e10$ photons of frequency $pu1.00e9 s-1$.

I know that to calculate the energy $E = hf$ is to be used. However, I am unaware as to what to do with the $pu5.00e10$ value and its meaning.

physical-chemistry energy

share|improve this question

edited Mar 17 at 11:24

andselisk

18.6k657122

asked Mar 17 at 11:06

Huda AlnusairiHuda Alnusairi

383

$endgroup$

add a comment | 

$begingroup$

I’m having trouble with calculating the energy of $pu5.00e10$ photons of frequency $pu1.00e9 s-1$.

I know that to calculate the energy $E = hf$ is to be used. However, I am unaware as to what to do with the $pu5.00e10$ value and its meaning.

physical-chemistry energy

share|improve this question

edited Mar 17 at 11:24

andselisk

18.6k657122

asked Mar 17 at 11:06

Huda AlnusairiHuda Alnusairi

383

$endgroup$

share|improve this question

edited Mar 17 at 11:24

andselisk

18.6k657122

asked Mar 17 at 11:06

Huda AlnusairiHuda Alnusairi

383

share|improve this question

edited Mar 17 at 11:24

andselisk

18.6k657122

asked Mar 17 at 11:06

Huda AlnusairiHuda Alnusairi

383

edited Mar 17 at 11:24

andselisk

18.6k657122

edited Mar 17 at 11:24

andselisk

18.6k657122

asked Mar 17 at 11:06

Huda AlnusairiHuda Alnusairi

383

asked Mar 17 at 11:06

Huda AlnusairiHuda Alnusairi

383

1 Answer
1

active

oldest

votes

5

$begingroup$

Analogy: you have 5 bottles of coke 1 L each; what is the total volume?

The formula you shown $(E = hf)$ is derived for exactly one photon.
Now, since you have 50 billion of photons $(N = pu5.00e10)$, guess what total energy it would be?

$$E_mathrmtot = Nhf = pu5.00e10cdotpu6.63e-34 J scdotpu1.00e9 s-1 = pu3.32e-14 J$$

share|improve this answer

edited Mar 17 at 11:50

answered Mar 17 at 11:41

andseliskandselisk

18.6k657122

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  How about if I am given instead of a frequency value a wavelength value along with the photon value, how do I answer solve for the energy.
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  $$f = fraccλ,$$ where $c$ – speed of light; $λ$ – wavelength.
  $endgroup$
  – andselisk
  Mar 17 at 12:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  For the speed of light do I use c= 3.00E8 and if I do, do I use the frequency value gained to solve for the energy?
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:32
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yes, you do, but mind the units. If you take $c = pu3.00e8 m s-1$, then make sure you plug in the wavelength in meters.
  $endgroup$
  – andselisk
  Mar 17 at 12:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you very much!
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:45
  

  
  
  
  

add a comment | 

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5

$begingroup$

Analogy: you have 5 bottles of coke 1 L each; what is the total volume?

The formula you shown $(E = hf)$ is derived for exactly one photon.
Now, since you have 50 billion of photons $(N = pu5.00e10)$, guess what total energy it would be?

$$E_mathrmtot = Nhf = pu5.00e10cdotpu6.63e-34 J scdotpu1.00e9 s-1 = pu3.32e-14 J$$

share|improve this answer

edited Mar 17 at 11:50

answered Mar 17 at 11:41

andseliskandselisk

18.6k657122

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  How about if I am given instead of a frequency value a wavelength value along with the photon value, how do I answer solve for the energy.
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  $$f = fraccλ,$$ where $c$ – speed of light; $λ$ – wavelength.
  $endgroup$
  – andselisk
  Mar 17 at 12:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  For the speed of light do I use c= 3.00E8 and if I do, do I use the frequency value gained to solve for the energy?
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:32
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yes, you do, but mind the units. If you take $c = pu3.00e8 m s-1$, then make sure you plug in the wavelength in meters.
  $endgroup$
  – andselisk
  Mar 17 at 12:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you very much!
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:45
  

  
  
  
  

add a comment | 

5

$begingroup$

Analogy: you have 5 bottles of coke 1 L each; what is the total volume?

The formula you shown $(E = hf)$ is derived for exactly one photon.
Now, since you have 50 billion of photons $(N = pu5.00e10)$, guess what total energy it would be?

$$E_mathrmtot = Nhf = pu5.00e10cdotpu6.63e-34 J scdotpu1.00e9 s-1 = pu3.32e-14 J$$

share|improve this answer

edited Mar 17 at 11:50

answered Mar 17 at 11:41

andseliskandselisk

18.6k657122

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  How about if I am given instead of a frequency value a wavelength value along with the photon value, how do I answer solve for the energy.
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  $$f = fraccλ,$$ where $c$ – speed of light; $λ$ – wavelength.
  $endgroup$
  – andselisk
  Mar 17 at 12:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  For the speed of light do I use c= 3.00E8 and if I do, do I use the frequency value gained to solve for the energy?
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:32
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yes, you do, but mind the units. If you take $c = pu3.00e8 m s-1$, then make sure you plug in the wavelength in meters.
  $endgroup$
  – andselisk
  Mar 17 at 12:36
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you very much!
  $endgroup$
  – Huda Alnusairi
  Mar 17 at 12:45
  

  
  
  
  

add a comment | 

$begingroup$

Analogy: you have 5 bottles of coke 1 L each; what is the total volume?

The formula you shown $(E = hf)$ is derived for exactly one photon.
Now, since you have 50 billion of photons $(N = pu5.00e10)$, guess what total energy it would be?

$$E_mathrmtot = Nhf = pu5.00e10cdotpu6.63e-34 J scdotpu1.00e9 s-1 = pu3.32e-14 J$$

share|improve this answer

edited Mar 17 at 11:50

answered Mar 17 at 11:41

andseliskandselisk

18.6k657122

$endgroup$

share|improve this answer

edited Mar 17 at 11:50

answered Mar 17 at 11:41

andseliskandselisk

18.6k657122

answered Mar 17 at 11:41

andseliskandselisk

18.6k657122

answered Mar 17 at 11:41

andseliskandselisk

18.6k657122