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[Mentor's note: this thread was moved from a non-homework forum, therefore it does not use the normal template for homework questions]

What is the speed of the electron in terms of the speed of the light when it is in the

I started with this equation to find the energy En=-E0(z^2/n^2)

From that i used the momentum=E/c and found momentum then derived v from p=mv

The system keeps saying im wrong, is there anything specific im missing or maybe an equation i should be using instead?

What is the speed of the electron in terms of the speed of the light when it is in the

**n**= 3 state in the Hydrogen atom?I started with this equation to find the energy En=-E0(z^2/n^2)

From that i used the momentum=E/c and found momentum then derived v from p=mv

The system keeps saying im wrong, is there anything specific im missing or maybe an equation i should be using instead?

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