A bat flying in a cave emits a sound and receives its echo 0.25 s later. How far away is the cave wall?

42.5

To determine the distance between the bat and the cave wall, we can use the speed of sound formula and the information given.

The speed of sound in air is approximately 343 meters per second.
Given that the bat emits a sound and receives the echo 0.25 seconds later, we can divide the time by 2 to find the time it takes for the sound to reach the wall and back.

0.25 seconds / 2 = 0.125 seconds

Now, using the formula distance = speed × time, we can calculate the distance:

Distance = Speed of sound × Time
Distance = 343 m/s × 0.125 s
Distance ≈ 42.875 meters

Therefore, the distance between the bat and the cave wall is approximately 42.875 meters.