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Q.

The radii of two Bohr's orbits of hydrogen atom are in the ratio of 4 : 9. Which of the following value of energy difference is not possible between the two orbits? [I.E. = 13.6 eV]

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a

0.472 eV

b

0.21 eV

c

0.66 eV

d

1.9 eV

answer is C.

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Detailed Solution

The ratios of the radius is given as;

r1r2=n12n22=49

So,

⇒n1n2=23 ⇒n1n2=0.66

Thus, the energy  difference of 0.66 ev is not possible between the two orbits

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