An important news announcement is transmitted by radio waves to people who are 120 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 3.6 m from the newscaster. take the speed of sound in air to be 350 m/s. what is the difference in time that the message is received? answer in units of ms.

The radio waves move at the speed of light: , and they cover a distance of  to reach the people, so the time they take to cover this distance is


Instead, the sound waves move at speed of sound: v=350 m/s and they cover a distance of S=3.6 m, so the time they take to reach the people is


Therefore, the difference in time between the two messages is

Texture and composition are different because they are not the same aspect. texture has to do with feel and so on, where as composition is the chemical makeup which you cant touch like you can texture.