State one similarity and one difference of sound of frequency 750Hz and ultrasound ​

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

4. who was the first one to measure the speed of light and conclude that it is finite? 5. who was the first philosopher who thought the speed of light is finite? 13. what is the speed of light numerically? 14. give an example of something moving faster than light 15. give an example for some particles or waves that