1. If it takes 16 ms for a bat to receive the ultrasonic sound wave reflected of

Question

1. If it takes 16 ms for a bat to receive the ultrasonic sound wave reflected off a mosquito, how far is the mosquito from the bat? Take the speed of sound as 345 m/s.

Express your answer using two significant figures.

2. A sonar generator on a submarine produces periodic ultrasonic waves at a frequency of 3.00 MHz . The wavelength of the waves in seawater is 5.05×104 m . When the generator is directed downward, an echo reflected from the ocean floor is received 10.5 s later.

a. How deep is the ocean at that point?

Explanation / Answer

1) distance =velocity*time=345*16*10-3=5.52m

2)speed=frequency*wavelength

speed=3*106*5.05*10-4

speed=1515m/s

depth of the ocean=speed*time=1515*10.5=15907.5m

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