B) A man is cutting down a tree with an axe. He hears the echo of the impact of the axe hitting the tree after 1.8 s.
i. What sort of obstacle could have caused the echo? [1]
ii. The speed of sound is 330 m/s. How far is the tree from the obstacle? [3]
c) Distinguish between the nature of sound waves in b and the water wave in a.

Which situation will have the highest resistance? a.long wire and high temperatureb.short wire and high temperaturec.long wire and cold temperaturedshort wire and low temperature

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.

J. j. thomson’s experiment disproved the theory that an atom