SRD

Thunderwave

1-level Evocation

A wave of thunderous force sweeps out from you. Each creature in a 15-foot cube originating from you must make a Constitution saving throw. On a failed save, a creature takes 2d8 thunder damage and is pushed 10 feet away from you. On a successful save, the creature takes half as much damage and isn't pushed.  
In addition, unsecured objects that are completely within the area of effect are automatically pushed 10 feet away from you by the spell's effect, and the spell emits a thunderous boom audible out to 300 feet.
At higher levels: When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.
2nd level: 3d8 thunder damage
3rd level: 4d8 thunder damage
4th level: 5d8 thunder damage
5th level: 6d8 thunder damage
6th level: 7d8 thunder damage
7th level: 8d8 thunder damage
8th level: 9d8 thunder damage
9th level: 10d8 thunder damage