Oscillations and Waves > Waves > Phase and Group Velocity | DCS# 3B30.50 |
organ pipe | 202-05-G |
water
manometer |
202-alcove |
T-connector |
202-05-G |
gas
cylinder
and regulator |
013A |
compressed
air |
201A |
When CO2 is used, v is about 20% lower than for air, so pitch drops about 20% (3 semitones in the musical scale). Pitch rises when helium or argon is used. The pitch also depends slightly on gas pressure so a manometer is used to see that pressures are the same in each case.