From aa6f398c6414af9542d14ae1fc1d74f5b5f49479 Mon Sep 17 00:00:00 2001
From: "T. van der Sar" <t.vandersar@tudelft.nl>
Date: Tue, 11 Feb 2020 16:44:54 +0000
Subject: [PATCH] Update 2_debye_model.md - added prior knowledge

---
 src/2_debye_model.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/2_debye_model.md b/src/2_debye_model.md
index 7e4cbfb9..37cc94d7 100644
--- a/src/2_debye_model.md
+++ b/src/2_debye_model.md
@@ -27,6 +27,15 @@ configure_plotting()
 
 _(based on chapter 2.2 of the book)_
 
+!!! success "Expected prior knowledge"
+
+    Before the start of this lecture, you should be able to:
+
+    - Describe how atoms are modeled in the Einstein model 
+    - Describe the low-temperature behaviour of the Einstein heat capacity per atom 
+    - Describe how the frequency of a sound wave depends on the wavenumber $k=2\pi/\lambda$ of the soundwave, where $\lambda$ is the wavelength.
+    - Formulate a volume integral in spherical coordinates
+    
 !!! summary "Learning goals"
 
     After this lecture you will be able to:
-- 
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