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प्रश्न
What is the energy in joules released when an electron moves from n = 2 to n = 1 level in a hydrogen atom?
विकल्प
1.635 × 10−18 J
0.750 × 10−18 J
2.906 × 10−18 J
4.361 × 10−18 J
MCQ
उत्तर
1.635 × 10−18 J
Explanation:
ΔE = `2.18 xx 10^-18 (1/"n"_1^2 - 1/"n"_2^2)`
= `2.18 xx 10^-18 (1/1^2 - 1/2^2)`
= `2.18 xx 10^-18 ((2^2 - 1^2)/(1^2 xx 2^2))`
= `2.18 xx 10^-18 (3/4)`
= 2.18 × 10−18 × 0.75
= 1.635 × 10−18 J
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