19. What is the ratio of speeds of electrons in Ist orbit of H-atom to Ith orbitone on (A) 2 (B) 8 (C) 3 (D) 27

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( r=V_{0} cdot frac{z}{eta} ) for ( H-a tan n, z=1 ) ( n=1 ) ( V_{H}=V_{0} ) Ga Hetion, ( z=2 ) ( n=4 ) ( Rightarrow quad V_{H e} t=V_{0} cdot frac{pi}{4}=frac{V_{0}}{2} ) ( therefore frac{V_{H}}{V_{M e^{+}}}=frac{V_{0}}{V_{0} / 2}=2 ) (A) ( frac{operatorname{tr} s}{2} )

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