Quantum physics- kinetic energy of electron after collision

In summary, the question is about the kinetic energy of an electron colliding elastically with an atom in ground state. The answer given is that the electron will have the same amount of energy after the collision, but the given answer is different. The question also asks what transitions are possible for the atom and what will be the kinetic energy of the initial electron after each process. The possible transitions are -10.4eV to -5.5eV and -10.4eV to -3.7eV, with the corresponding kinetic energy values of 2.1eV and 0.3eV.
  • #1
desmond iking
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2

Homework Statement



since the bombarding electron has only 7.0eV ... it's not sufficient for the electron in the ground state to be excited which needs 10.4eV , so no excitation occur. and in my opinion, the bombarding electron should emerge with the same amount of energy ... but the ans given is here different . Can somoene explain what's the ans is about? thanks! [/B]

Homework Equations

The Attempt at a Solution


SAMPLE ANS : 7.0- ( (-3.7eV) - (-10.4eV) ) = 0.3eV...
 

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  • #2
The picture does not show what the question is.
You cannot discuss the answer unless you know the question.:)
 
  • #3
Sorry.. The question should be
If the kinetic energy of an electron 7.0eV collides elastically with an atom in ground state , what's the kinetic energy of the elctron after collision? Ps I forgot to post the question...
 
  • #4
It need 10.4 eV to ionize the atom but not to excite it.
The atom can go from the ground state to one of the other states in the diagram. This transition will require less than 10.4 eV. Which transitions are possible in this case?
 
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  • #5
nasu said:
It need 10.4 eV to ionize the atom but not to excite it.
The atom can go from the ground state to one of the other states in the diagram. This transition will require less than 10.4 eV. Which transitions are possible in this case?
-10.4eV to- 5.5eV , -10.4eV to -3.7eV are possible
 
  • #6
What will be the KE of the initial electron after each of these two processes?
 
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  • #7
for -10.4eV to- 5.5eV , using ke= hf-W
i have ke= 7.0eV - ( 10.4-5.5) = 2.1eV
for -10.4eV to -3.7eV , i have ke= 7.0eV - ( 10.4-3.7) =0.3eV

so? what does it mean?
 
  • #8
What do you mean?
What was the question, again?
 
  • #9
nasu said:
What do you mean?
What was the question, again?
If the kinetic energy of an electron 7.0eV collides elastically with an atom in ground state , what's the kinetic energy of the elctron after collision?
 
  • #10
So what did you find in the previous calculation? Were not these values of kinetic energy after collision?
 

Related to Quantum physics- kinetic energy of electron after collision

1. What is quantum physics?

Quantum physics is the branch of physics that studies the behavior of matter and energy at a very small scale, such as atoms and subatomic particles.

2. How is kinetic energy of an electron calculated after a collision?

The kinetic energy of an electron after a collision can be calculated using the conservation of energy principle. This means that the total energy before the collision is equal to the total energy after the collision. The kinetic energy of the electron can be calculated by subtracting the initial kinetic energy from the final kinetic energy.

3. What factors affect the kinetic energy of an electron after a collision?

The kinetic energy of an electron after a collision can be affected by factors such as the mass and velocity of the colliding particles, the angle of collision, and any external forces acting on the particles.

4. Can the kinetic energy of an electron be negative after a collision?

Yes, the kinetic energy of an electron can be negative after a collision. This can happen if the electron loses energy during the collision, such as in an inelastic collision where some of the kinetic energy is converted into other forms of energy like heat or light.

5. How does quantum physics explain the behavior of electrons after a collision?

In quantum physics, the behavior of electrons after a collision is explained by the wave-particle duality principle. This means that electrons can behave both as particles and waves, and their movements are described by probability waves. The probability of finding an electron in a specific location is determined by its wave function, which is influenced by external factors like collisions.

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