According to Bohr's model of the hydrogen atom, what is the radius of the second orbit (), given that the radius of the ground state orbit () is ?

Answer and explanation

Correct answer: B.

  1. Step 1: In Bohr's model of a hydrogenic atom, the orbital radius scales quadratically with principal quantum number: .
  2. Step 2: For hydrogen () in the second Bohr orbit (), .
  3. Step 3: Calculate: .
Answer
.
Why not the others: scales linearly (); uses or doubles ; divides by 2.

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