The wave function ψ of a certain system is the linear combination ψ=√(1/4) ψ₁+√(3/4) ψ₂ where ψ₁ and ψ₂ are… · ABC26PH0143

Subject: Physical Chemistry · Chapter: Quantum Chemistry · Topic: Quantum Chemistry – General · Exam: CSIR NET 2013 · Marks: 2 · Difficulty: Medium

The wave function $\psi$ of a certain system is the linear combination
\[ \psi=\sqrt{\dfrac{1}{4}}\,\psi_1+\sqrt{\dfrac{3}{4}}\,\psi_2 \]
where $\psi_1$ and $\psi_2$ are energy eigen functions with eigen values (non-degenerate) $E_1$ and $E_2$ respectively. What is the probability that the system energy will be observed to be $E_1$?
(a)$\sqrt{\dfrac{3}{16}}$
(b)$\frac{3}{4}$
(c)$\frac{1}{4}$
(d)$\sqrt{\frac{1}{4}}$
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
The probability of observing E₁ is |c₁|²/(|c₁|² + |c₂|²); for ψ = ½ψ₁ + (√3/2)ψ₂ this is 1/4 (c).

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