Bad Qubits — Learn Quantum by Doing

Multiple choice

The first-order transition amplitude magnitude is |c_fi| = (|Vfi|/hbar) * 2|sin(wfi*t/2)| / |wfi|. With hbar = 1, Vfi = 0.5, wfi = 2, and t = 1, what is |c_fi|?

≈ 0.1771 (squared the amplitude into a probability)
≈ 0.2104 (dropped the factor of 2)
≈ 0.4207
≈ 0.4546 (used sin(wfi*t) instead of sin(wfi*t/2))