Which number of planets are in oreader towards the sun?

a. mars,earth,venus, mercury,neptune,uranus, saturn, jupiter

b. jupiter, saturn, uranus, neptune,mars,earth,venus,mercury
c. neptune,uranus, saturn,jupiter, mars,earth,venus, mercury

C. the order from closest to the sun to furthest is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune so C. would be the opposite heading towards the sun. A good mnemonic to use is MVEMJSUN: My Very Educated Mother Just Served Us Nectarines

The answer is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Right Decreasing the temperature of the matter  

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.