Centripetal Force hydrogen atom

AI Thread Summary
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.18 × 10^6 m/s, and the radius of its circular orbit is 5.02 × 10^−11 m. A user initially struggled to calculate the centripetal force due to confusion over the mass of the electron versus the mass of the hydrogen atom. After clarifying that the correct mass to use is that of the electron, which is 9.1 × 10^−31 kg, the user successfully applied the centripetal force formula F=mv^2/r. The interaction highlights the importance of using the correct values in physics calculations. Ultimately, the user expressed gratitude for the assistance received.
gswagmoney
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Question:
In the Bohr model of the hydrogen atom,
the speed of the electron is approximately
2.18 × 106 m/s.
Find the central force acting on the electron
as it revolves in a circular orbit of radius
5.02 × 10−11 m.
Answer in units of N.
Comment on Attempt:
Ok I tried using the centripetal force formula of F=mv^2/r , but i wasn't given the mass. So i looked it up, the mass being 1.007, and it still wasn't the correct answer. I'm not sure if I need to somehow cancel out the mass with another formula, Thank you for helping :-)
 
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Hello and welcome to PF!
Did you look up the mass of the electron or the mass of the hydrogen atom? Which one do you need? Also, make sure you find the value of the mass in SI units.
 
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TSny said:
Hello and welcome to PF!
Did you look up the mass of the electron or the mass of the hydrogen atom? Which one do you need? Also, make sure you find the value of the mass in SI units.
YAY! Ok I misread and just found the mass of a hydrogen atom, not the electon, which is 9.1e-31 and when I plugged that into the equation it worked! I cannot tell you how happy I am right now, Thank You so much for replying to me, this made my day. Thank You again
 
OK. Good work!
 

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