Out of the following options in which case in the velocity of electron greater than `1.5xx10^(6)`m//s. {hc=1240 eV-nm}A. An electron moving in the first Bhor radius of hydrogen atomB. The electron which is accelerated from rest positiove by an potenital of `3.4 eV`.C. The electron having deBroglie wavelenght of `2pixx0.529Å`.D. The electron with maximum kinetic energy emitted from a mental whose threshlod wavelenght wavelenght is 400 nm and is subjected to eleectromagnetic radiations having wavelenght 124nm.

Out of the following options in which case in the velocity of electron

1.	Out of the following options in which case in the velocity of electron greater than `1.5xx10^(6)`m//s. {hc=1240 eV-nm}A. An electron moving in the first Bhor radius of hydrogen atomB. The electron which is accelerated from rest positiove by an potenital of `3.4 eV`.C. The electron having deBroglie wavelenght of `2pixx0.529Å`.D. The electron with maximum kinetic energy emitted from a mental whose threshlod wavelenght wavelenght is 400 nm and is subjected to eleectromagnetic radiations having wavelenght 124nm.
Answer» Correct Answer - A::C::D (A) `V_(1)=2.188xx10^(6)xx(Z)/(n)m//sec.` `V_(1)(ngt1)=2.188xx10^(6)m//sec.` (B) `3.4xx1.6xx10^(-19)=(1)/(2)xx9.1xx10^(-31)xxV^(2)` `V=(2xx3.4xx1.6)/(9.1)=10^(+12)` `=1.09xx10^(6)m//sec` (c) `2pir=nlambda` `2pi(0.529xxn^(2)/Z)-nxx2pixx0.529` `n=1` `V_(1)=2.18 xx10^(6) m//sec` (D) energy of electron `= 6.9 eVrArr(1)/(2)mv^(2)` `v=1.55xx10^(6)m//sec`]

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