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Q.

A hydrogen-like atom has one electron revolving around a stationary nucleus. The energy required to excite the electron from the second orbit to the third orbit is 47.2eV. The atomic number of the atom rounded to the nearest integer is 

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a

6

b

3

c

4

d

5

answer is C.

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Detailed Solution

13.6z214−19=47.2

z2=24.9≃25z=5

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