An experiment to measure the speed of sound was carried out. David, who is 200m from a large brick wall clapped two pieces of wood together many times, each time he heard the echo (reflected sound) he immediately clapped again. Maryam used a stopwatch to time how long it took for 10 claps and echos. Explain why they timed 10 clap/echoes and not just 1?

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as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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higher potential

explanation:

because it is in a high speed so it must move into a of high potential