Gas Density (kg/m3) Bulk modulus (N/m2) air 1.23 1.42 105 helium 0.179 1.01 105 (a) Based on these figures and equations from Lecture 12 (or from the book), calculate the speed of sound in air. How does your result compare with the known speed of sound, which is 343 m/s? (b) What would be the speed of sound on a planet with a helium atmosphere? (c) An organ pipe plays the note C4 on Earth. What note would it play on the planet with the helium atmosphere