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What is the energy content kJ per mol of a mole of photons of red light with a wavelength of 700 nm?
Wiki User
∙ 14y ago
What in tarnation is a "mole" of photons ???
Don't you have to know the atomic number or the molecular weight of an element or compound
in order to know the size of a mole ?
Do you happen to know the atomic number or the molecular weight of a Photon ???
I don't think Avogadro was talking about photons.
Wiki User
∙ 14y ago
Wiki User
∙ 9y agoYou were going along so nicely there, and it seemed that you were just about to specify a wavelength, when suddenly the circuit went silent. If I want to work with the question, then, I'll have to invent my own plausible wavelength.
You DID mention 'visible' light. Without looking anything up, let's say that the visible wavelength band is 400nm to 750 nm. Then the center of the band is 548 nm, and the corresponding frequency is c/5.48 x 10^-9 Hz.
The energy of each photon is hf .
h = 6.63 x 10^-34 joule-sec.
You want a mol of them, so that's 6.022 x10^23 .
Finally the energy is (6.022 x 10^23) (c/ 5.48 x 10^-9 ) = 3.294 x 10^40 joules.
You asked for the energy in kilojoules, so that's 3.294 x 10^37 kilojoules.
This is, shall we say, a fair amount of energy. In fact, a seriously not-insignificant quantity of the stuff.
I'm reminded of the humble LED, with 1.5 volts of forward bias, conducting 15 mA, and pouring out red light with 75% efficiency. In order to accumulate the above amount of energy in the form of visible light, you would need to collect and energize something like 1.95 million trillion trillion trillion of these LEDs. All I can say to you is: Don't stand in front of them, and if you do, then remember not to look directly at them.
Wiki User
∙ 7y agoFirst calculate the frequency: c = wavelength x frequency
3x10^8 m/s = 7x10^-7 m x frequency
frequency = 4.3x10^14 s^-1
Next, calculate the energy: E = planck's constant x frequency
E = 6.63x10^-34 J/s x 4.3x10^14 s^-1
E = 2.85x10^-19 J <---ANSWER
Wiki User
∙ 14y agoLight of 700 nm has an energy of 171 kj/mol.
Wiki User
∙ 7y agoThe energy of a single photon of red light with a wavelength of 700,0 nm is 1,7712 eV.
Wiki User
∙ 11y ago1.710x105 J/mol
Wiki User
∙ 13y ago246kJ
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The shorter the wavelength of visible light means what?
The shorter the wavelength of visible light, the higher the frequency and the greater the energy of the photons.
Why is there no substance that convert visible light to UV?
UV photons have more energy (less wavelength, higher frequency) than visible light photons. It is possible to convert photons to ones with less enery, but not the opposite.
Which color has the least amount of energy per photon?
High-energy photons correspond to short-wavelength light while low-energy photons correspond to long-wavelength light. In short, the answer is red. For short-wavelengths (high energy photons) it would appear blue.
Why are the photons that emerge from the Sun's surface visible-light photons and infrared-light photons rather than gamma-ray photons?
Photons do not come in different types like infared-photons etc. they are just the wavelength that the photons are at and nuclear fusion just happens to emit photons at a particular wavelength
How do you calculate the energy content of photons in moles?
To calculate the number of photons, you need the formula E=hf where h is Planck's constant with a value of 6.63*10^-34Js and f should be given. If f isn't given, then use the formula C = f * wavelength. Rearrange this formula by using the wavelength given and the C, speed of light, which is 3*10^8. You should get C/wavelength = f, which will then be placed into E=hf => answer. What you also need is the Intensity. This way you obtain the photon flux as: I/E (i.e. the number of photons per unit area and unit time).
How does the amount of energy in the light changes as the wavelength increases?
The energy of the photons decreases as the wavelength increases
What are the content of sunlight?
Photons (energy packets of light)
If the energy of 1.00 mole of photons is 346 kJ what is the wavelength of the light?
289nm
Photons of light?
... have roughly double the energy of photons of red light, because their frequency is roughly double the frequency of red-light photons. (That also means that their wavelength is roughly half the wavelength of red-light photons, but this fact doesn't help the current discussion at all.)
How are wavelength frequency and energy are related?
Energy of light photons is related to frequency as Energy = h(Planck's constant)* frequency Frequency = velocity of wave / wavelength So energy = h * velocity of the wave / wavelength
How are wavelength and frequency and energy related for photons of light?
They are inversely proportional or relationship to each other.
Which colour has the shortest wavelength?
Shortest wavelength means the highest frequency, meaning the photons have the highest energy. That is color violet. The violet light colors the skin brown. Red light with lower energy photons cannot do that.
The shorter the wavelength of visible light means what?
The shorter the wavelength of visible light, the higher the frequency and the greater the energy of the photons.
Which had the lower energy quanta red light or blue light?
Light of is made up of a finite number of photons, or light quanta. The energy of each photon is proportional to the frequency of the light, and hence inversely proportional to the wavelength of the light. Red light has a longer wavelength than blue light, so the quantum of red light has less energy than the quantum of blue light.
Why is there no substance that convert visible light to UV?
UV photons have more energy (less wavelength, higher frequency) than visible light photons. It is possible to convert photons to ones with less enery, but not the opposite.
Which color has the least amount of energy per photon?
High-energy photons correspond to short-wavelength light while low-energy photons correspond to long-wavelength light. In short, the answer is red. For short-wavelengths (high energy photons) it would appear blue.
What is the numbers of photons of light with a wavelength of 4000 pm that provide J of energy?
2.012 x 10^(16)
