It has been postulated that harbor seals use something similar to sonar to locate their pups by measuring the differences in reflected acoustic wave arrival times in air and in water. Estimate, using thermodynamics, how far a mother seal is from her pup if the difference in arrival times is 3 seconds. Assume that air is an ideal gas with C_V= 5/2R. Use a temperature of 2C for both air and water. The speed of sound is given by: _C = [(p/)_S,n]^0.5 where = m/V , and m is the mass.

Note: * = MW/ V , where MW is the molecular weight.

*Water properties can be found in the NIST web-book.