1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
UkoKoshka [18]
3 years ago
15

How many photons are produced in a laser pulse of 0.862 J at 691 nm?

Chemistry
1 answer:
Inga [223]3 years ago
4 0
To calculate how many photons are in a certain amount of energy (joules) we need to know how much energy is in one photon.
Start by using two equations:
Energy of a photon = Frequency * Planck's constant (6.626 * 10^(-34) J-s)
Speed of light (constant 3 * 10^8 m/s) = Frequency * Wavelength
Which means:
frequency = Speed of Light / Wavelength
So energy of a photon = (Speed of light * Planck's constant)/(Wavelength)
You may have seen this equation as E = hc/<span>λ</span>
We have a wavelength of 691 nm or 691 * 10^-9 meters
So we can plug in all of our knowns:
E = (6.626 * 10^(-34) J-s) * (3.00 * 10^8 m/s) / (691 * 10^-9 m) = 
2.88 * 10^(-19) joules per photon
Now we have joules per photon, and the total number of joules (0.862 joules)
,so divide joules by joules per photon, and we have the number of photons:
0.862 J/ (2.88 * 10^(-19) J/photon) = 3.00 * 10^18 photons.

You might be interested in
If C and Cl combined to make a compound, would it be covalent or ionic?
arsen [322]

Answer:

it would be a covalent bond

Explanation:

carbon has 4 valence electrons, while chlorine has 7.

6 0
2 years ago
Help please please please!
LenaWriter [7]

Answer:

I say the second one, im not rlly sure tho

Explanation:

5 0
2 years ago
Why do people want different kinds of light bulbs?
ololo11 [35]

Answer:

LED bulbs fit standard light sockets and are the most energy-efficient option. LEDs have lower wattage than incandescent bulbs but emit the same light output. This allows them to produce the same amount of light but use less energy. LEDs can last over 20 years and don't contain mercury

7 0
2 years ago
In 1953, who devopled the model that is shown below
PilotLPTM [1.2K]
What model? can you screenshot it or send a link?
7 0
3 years ago
The heat of fusion for water is the amount of energy that must be absorbed for water to _____.
ivanzaharov [21]
I would say A.evaporate because the water is getting absorbed.

4 0
3 years ago
Other questions:
  • Can anyone help me if possible?
    5·1 answer
  • Which would be true if you went to the moon
    11·2 answers
  • Im trying to get in fresman honors science so i want to make sure i get this right.
    9·2 answers
  • _NH, +_02 - _ NO, +_ H,0
    14·1 answer
  • How do you determine the atomic mass of an element?
    8·1 answer
  • What is the volume of gas at a temperature of 200.0 K if its original volume was
    14·1 answer
  • How to get pH from OH-
    14·1 answer
  • Which phrase best defines a covalent bond?
    15·1 answer
  • Can someone please try to help me? I’ll give you brainiest
    14·1 answer
  • Science edpuzzle <br> All of the following describe a chemical change, EXCEPT…
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!