If the speed of electron in the Bohr's first orbit of hydrogen is x, the speed in the third orbit is:
Correct answer: B. x/3
- A. x/9
- B. x/3
- C. 3x
- D. 9x
Explanation
According to Bohr's model, the speed of an electron in an orbit is inversely proportional to the principal quantum number (n). The formula for the speed (v) of an electron in the nth orbit is given by: v ∝ 1/n If the speed of an electron in the first orbit (n = 1) is x, then the speed in the third orbit (n = 3) will be: v3 = v1 x (1/n3) = x * (1/3) = x/3
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