Question

The energy of the emitted photon when an electron in Be3+ ion returns from n=2 level to ground state is- (A) 2.616 × 10-17 J (B) 26.16 * 10-17 J (C) 216.6 x 10-17 J (D) 2616 × 10-17 J​

Answer 1

Explanation:

Correct option is

A

1.76×10

−18

J

Energy transition is,

v

ˉ

×hc=hc×R×Z

2

(

n

1

2

1

−

n

2

2

1

)=6×10

−34

×3×10

8

×1.1×10

7

×(1−1/9)=1.76×10

−18

J