[" For which orbit in "He^(+)" ion,the circumfer- "],[" ence is "26.5 AA" ? "]

Find the area of the circle if its circumfer­ence is 88 cm.

A unit positive charge is moved along the circumfer-ence of a circle of radius, r with a -5muC charge at the centre at the centre of the circle. Then, the work done in the process is "______" .

Which of the following orbit of He^(+) ion will have the same energy as that of second orbit of hydrogen atom?

Calculate the radius of the first Bohr orbit of a He^(+) ion and the binding energy of its electron in the ground state.

" The radius of "1" st "" Bohr orbit of H-atom is "0.53A^(@)" Calculate the radius of "2^(" nd ")" orbit of "He^(+)" ion.(At No.of He "=2" ) in "A^(@)

Which s larger, an He^(+) ion with electron in 3rd orbit or Li^(2+) ion with electron in 5th orbit ?

Which s larger, an He^(+) ion with electron in 3rd orbit or Li^(2+) ion with electron in 5th orbit ?