STANDARDPhysics-Atomic Structure
STANDARD Physics Bohr's Model MCQ Question
Type: MCQ-conceptual-Medium-Class 11
According to Bohr's theory, the wave number of last line of Balmer series is (R = 1.1 × 10⁷ m⁻¹)
A
5.5 × 10⁵ m⁻¹
B
4.4 × 10⁷ m⁻¹
C
2.75 × 10⁶ m⁻¹
D
2.75 × 10⁸ m⁻¹
Correct Answer
Option C
Detailed Explanation
For last line of Balmer series, n₁ = 2 and n₂ = ∞. Using the formula for wave number, we get 1/λ = R(1/n₁² - 1/n₂²) = 1.1 × 10⁷/4 = 2.75 × 10⁶ m⁻¹.
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