Your lab teaching assistant may review these questions with you during your lab. 1.) Describe how the first fundamental frequency changes when you change the length of Page 2 of 5 Toronto Metropolitan University - PCS 130 an closed ended tube system. Write the general equation for length of a closed ended tube system as a function of frequency and harmonic number, n. 2.) In a closed ended tube system (one closed end and one open end), describe where the nodes and anti-nodes are located when a standing (resonant) sound wave is formed. Try to describe this for the general case. 3.) From Eqn. 1, derive/explain the formation of Eqn. 2. 4.) Does the speed of sound increase or decrease with air temperature