Circular Motion with a hydrogen atom

AI Thread Summary
In the discussion about calculating the central force acting on an electron in a hydrogen atom, the user attempts to apply the formula Fc = m*v^2/R using a mass of 1.674e-27 kg and a speed of 2.01e6 m/s. However, they repeatedly receive an incorrect answer from their homework service, UTexas. Other participants point out that the user is likely using the wrong mass value and suggest verifying that it corresponds to the mass of an electron. The correct mass of an electron is approximately 9.11e-31 kg, which should be used in the calculation. Accurate values are crucial for obtaining the correct force in such physics problems.
all_relative
Messages
6
Reaction score
0

Homework Statement


In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.01e6 m/s.
Find the central force acting on the electron as it revolves in a circular orbit of radius 4.84e-11 m.
Answer in units of N.


Homework Equations



Fc=m*v^2/R

The Attempt at a Solution


I said that the mass was 1.674e-27 kg. If i should use another number, please let me know.

Fc=m*v^2/R
Fc=(1.674e-27)*(2.01e6)^2/(4.84e-11)
Fc=1.39e-4

When I submit this answer to UTexas (an online HW service) it says that I am wrong. I have done this problem several times and keep getting the same thing.

Thanks!
 
Physics news on Phys.org
all_relative said:

Homework Statement


In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.01e6 m/s.
Find the central force acting on the electron as it revolves in a circular orbit of radius 4.84e-11 m.
Answer in units of N.


Homework Equations



Fc=m*v^2/R

The Attempt at a Solution


I said that the mass was 1.674e-27 kg. If i should use another number, please let me know.

Fc=m*v^2/R
Fc=(1.674e-27)*(2.01e6)^2/(4.84e-11)
Fc=1.39e-4

When I submit this answer to UTexas (an online HW service) it says that I am wrong. I have done this problem several times and keep getting the same thing.

Thanks!

You are not using the right value for the mass.
 
hage567 said:
You are not using the right value for the mass.

What is the correct value for the mass?
I looked it up on Google and that is what I found.

Thanks.
 
You are looking for the mass of an electron. Is that what you googled?
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

Determine the speed and tension of keys swinging in a circular path
Replies
8
Views
2K
[Grade 12 Physics] Gravitational/circular motion #2
Replies
5
Views
2K
Electrical forces, application of Colomb's law
Replies
3
Views
2K
Amusement Park Centripetal Force Question.
Replies
11
Views
5K
[Grade 12 Physics] Circular/gravitational motion
Replies
21
Views
3K
Work Check - Centripetal force - Finding Tension in a Rope
Replies
8
Views
2K
The Total Energy of the Hydrogen Atom's Electron
Replies
2
Views
1K
Circular motion grade 12 physics
Replies
4
Views
2K
What Is the Minimum Speed and Tension in a Swinging String with Keys?
Replies
27
Views
4K
Centripetal Force hydrogen atom
Replies
3
Views
3K

Hot Threads

Recent Insights

Back
Top