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Let T1 and T2 be the energy of an electr...

Let `T_1` and `T_2` be the energy of an electron in the first and second excited states of hydrogen atom respectively. According to bohr's model of an atom, the ratio `T_1 : T_2` is:

A

`9:4`

B

`1:4`

C

`4:1`

D

`4:9`

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