The red beam will always have more energy, no matter what. Each statement below is false. Rewrite each, making whatever changes are necessary to make it true. Sound travels faster in cold air than warm because cold air is denser. Sound travels slower in cold air than warm because cold air molecules move more slowly .
Sound travels faster in warm air than cold because cold air molecules move more slowly .
Sound travels faster in warm air than cold because warm air molecules move more quickly . As you are standing on the sidewalk, a firetruck zooms past with its siren wailing. The frequency of the siren decreases as the truck approaches you. The frequency of the siren increases as the truck approaches you. The frequency of the siren decreases as the truck recedes away from you .