In a large soccer stadium suppose you are sitting 200 m away from the ball as it

Question

In a large soccer stadium suppose you are sitting 200 m away from the ball as it is Find the time that elapses before the sound (v = 340 m/s) of the ball being kicked arrives at your eye. You see the kick much earlier than your hear it. Find the time it takes for light to travel to you (see Appendix C for the speed of light). Compare the two times and comment on your result.The driver of the car next to you in traffic is playing extremely loud music, and you make hand gestures to get his attention. If the new sound intensity is 30% less than before, find the change in sound level, in dB.

Explanation / Answer

A) V=d/t

340m/s = 200m / time(s)

time = 0.5882 seconds

B) c=d/t

299,792,458 m/s = 200m / time(s)

time = 0.00000066712819 seconds

C) The time it takes for light to travel is many times shorter than the time it takes for sound to travel. Therefore, you see the ball being kicked and then hear the sound.

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