Update 1_einstein_model.md

src/1_einstein_model.md

@@ -37,7 +37,7 @@ _(based on chapter 2.1 of the book)_
     After this lecture you will be able to:
 
     - Explain quantum mechanical effects on the heat capacity of solids (Einstein model)
-    - Compute the expected particle number, energy, and heat capacity of a quantum harmonic oscillator (a single boson)
+    - Compute the expected particle number, energy, and heat capacity of a quantum harmonic oscillator (a bosonic mode)
     - Write down the total thermal energy of a material