Compare the velocities of electron in 1. H 1st orbit 2. He+ 1st orbit 3. Li++ 2nd orbit
A
(1) > (2) > (3)
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B
(1) = (3) > (2)
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C
(1) < (3) < (2)
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D
None of these
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Solution
The correct option is C(1) < (3) < (2) vn=ZnVo Velocity of electron in the nth orbit for a Hydrogen like atom is given by the above formula. Here vo=2.19×106m/s very close to the speed of light 1th100 of 'c' but yet very close. Let’s find for given cases (1) H 1st orbit Zn=1 n=1 V=Vo