NEET 2019 Odisha · PhysicsMatter wavePrevious Year Question
A proton and an α-particle are accelerated from rest to the same energy. The de Broglie wavelengths λ_p and λ_α are in the ratio:
Answer: (C) 2 : 1. Answer: (c) 2 : 1 Solution: λ = h/√(2mE).
- A.√2 : 1
- B.1 : 1
- C.2 : 1✓
- D.4 : 1
Correct Answer
(C) 2 : 1
Solution & Explanation
Answer: (c) 2 : 1 Solution: λ = h/√(2mE). Same energy E ⇒ λ ∝ 1/√m. λ_p/λ_α = √(m_α/m_p) = √4 = 2. λ_p : λ_α = 2 : 1.
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