Nold times, before there were train signals, people who worked on the railroad would often put their ear down to the train track to listen for an oncoming train. why would this result in hearing the train further off than just listening for the train through the air? question 3 options: sound travels slower, but louder through solid material because it is more dense, so the train could be heard better this way. sound travels slower in air because there are often trees and other items blocking the sound. sound waves travel faster in more dense material, and the more dense the material the louder the sound is. people did not do this because sound travels faster through less dense material, like air, rather than more dense materiel, like train tracks.

Absalon adds 1 g of salt to 1 l of room temperature water (25 °c). then, he starts a timer and observes what happens. he notices that it takes 1 minute for the salt to dissolve. he decides to repeat his experiment, and he adds 1 g of salt to another 1 l of room temperature water (25 °c). after he adds the salt, he starts a timer. but, instead of watching the salt dissolve, he stirs the salt and water with a spoon until it dissolves. he notices that it only takes 30 seconds for the salt to dissolve in his second experiment. why does the salt dissolve faster in absalon's second experiment? stirring the salt and water increases the polarity of the water molecules, which causes the ionic bonds of the salt to break. stirring the salt and water increases particle motion, which causes more collisions to occur between the water and salt. stirring the salt and water increases the surface area of the water, which causes more collisions to occur between the water and salt. stirring the salt and water increases the pressure on the solution, which causes the ionic bonds of the salt to break.