Q.

The energy of hydrogen atom in nth orbit is En, then the energy in nth orbit of singly ionized helium atom will be

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a

En/2

b

En/4

c

4En

d

2En

answer is A.

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Detailed Solution

WehaveEn=2π2mK2Z2e4n2h2.

For helium Z = 2 hence requisite answer is 4En,

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