Question

Electronic transition in He+ ion takes from n2
to n, shell such that :
2n2+ 3n1= 18
2n2 – 3n1, = 6
What will be the total number of photons
emitted when electrons transit to n1, shell ?
(1) 21 (2) 15 (3) 20 (4) 10
​

Answer 1

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Option 4) 10 is the correct option ✔️

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Answer 2

Answer:

Option 4 which is 10 electrons.

Explanation:

Since the equations are given so we know that 2N2 + 3N1 = 18 and the other equation 2N2 - 3N1 = 6. The equations on solving we will get the values of N1 and N2 by subtracting the seconds equation from the first.

So, the value of the N1 will be 2 and the value of the N2 will be 6 hence, the difference of the number of shells will be N2 - N1 which is 4. Since, we know the formulae to calculate the number of photons hence, the number of photons will be 4*(4+1)/2 = 10 electrons.