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-rw-r--r--source/know/concept/fermis-golden-rule/index.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/source/know/concept/fermis-golden-rule/index.md b/source/know/concept/fermis-golden-rule/index.md
index 021c8e4..ea58ee6 100644
--- a/source/know/concept/fermis-golden-rule/index.md
+++ b/source/know/concept/fermis-golden-rule/index.md
@@ -20,7 +20,7 @@ time.
From [time-dependent perturbation theory](/know/concept/time-dependent-perturbation-theory/),
we know that the transition probability
for a particle in state $$\Ket{a}$$ to go to $$\Ket{b}$$
-is as follows for a periodic perturbation at frequency $$\omega$$:
+is as follows for a sinusoidal perturbation at frequency $$\omega$$:
$$\begin{aligned}
P_{ab}