IN QUSTION NUMBER 7, PART 6 OF eds 2006, DO U THINK THAT YOU HAVE FOLLOWED THE LAPLACE RULE, ACCORDING TO WHICH SOUND SPEED IN MEDIUM IS INVERSELY PRPORTIONAL TO SQUARE OF DENSITY SO I THINK IT SHOULD BE FALSE.
WHAT YOU SAY IS AIR MORE DENSE OR IRON SO...? WELL DO TELL
take care Hafiz