At first, wave A and wave B are identical. Then, wave A passes through a wooden table and wave B passes through a swimming pool. Which of the following is true about the waves AFTER they encountered different media? Wave A and B have the same speed.

Wave B has a faster speed than wave A.

Wave A has a faster speed than wave B.

There is not enough information to tell.

Hey there

A) wave A and B have the same speed.

When they return to the air they will have the same speed. Yes they did have different speeds in water and wood but now they are back in air ("AFTER they encountered different media").

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

i think the answer is a, hope this : )