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| 1. |
Calculate the sound speed in helium gas at 440K |
| Answer» V= MrRT M= N 1 +n 2 n 1 M 1 +n 2 M 2 =(1×4+2×32)/(1+2)=68/3×10 −3 kg/molFor mixture;C v = n 1 +n 2 n 1 Cv 1 +n 2 Cv 2 C v for HELIUM =3R/2C v for oxygen =5R/2C−v(1×3R/2+2×5R/2)/(1+2)=13R/6C p =C v +R=R+13R/6=19R/6Now,Y mix =C p /C v =19/13V mix =0.068/3kg/molNow, SPEED of sound in mixture = 368 ×10 −3 1319 × 325 ×300 =400.9m/s | |