Question

The angular momentum of electron in hydrogen atom in first orbit is ' \(L\) '. The change in angular momentum if electron is in second orbit of hydrogen atom is

• A. \(2 L\)
• B. \(L\)
• C. \(\frac{L}{2}\)
• D. \(4 L\)

Hint:

Bohr rule: $L_n = n\hbar$

Answer 1

The Correct Option is B

Concept: Bohr’s quantization: \[ L_n = n\hbar \]

Step 1: First orbit. \[ L_1 = \hbar = L \]

Step 2: Second orbit. \[ L_2 = 2\hbar = 2L \]

Step 3: Change in angular momentum. \[ \Delta L = L_2 - L_1 = 2L - L = L \]

Step 4: Conclusion.
Change in angular momentum = $L$ Final Answer: Option (B)