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Physics Chemistry

Entry Test MCQ :: Atomic Spectra

  The electric P.E of an electron in an orbit at a distance rn from the positive charge
[A]. Ke2/rn[B]. Ke2/rn2
[C]. ?Ke2/rn[D]. ?Ke2/rn2

Answer: Option C
Annie said:    
 
what is the difference b/w options a and c?
annykhan said:    
 
? sign is for minus
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