Con Question 1
Giovanni sprinkled iron filings around a magnet. Which of the following did Giovanni most likely see?
The iron filings lining up with the magnetic field lines
The iron filings accumulating only at the poles of the magnet
The iron filings randomly falling around the magnet
D
The iron filings lining up against the magnetic field lines
US

In general, sound (mechanical waves) travels faster in solids than in liquids or gases. This is because the speed of the mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is:density).

In other words: The speed of sound varies depending on the medium through which the sound waves travel.

In addition, it varies with changes in the temperature of the medium. This is because an increase in temperature means that the frequency of interactions between the particles that transport the vibration increases, hence this increase in activity increases the speed. That is why the speed of sound in a gas is not constant, but depends on the temperature.

So, if we want the speed of sound in a gas to decrease, the temperature of that gas must decrease, as well.