In old 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 options: people did not do this because sound travels faster through less dense material, like air, rather than more dense materiel, like train tracks. 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.

The answer to your question is D. Sound waves travel faster in more dense material, and the more dense the material the louder the sound is.

h let me think

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."