5. A plane travels horizontally at 1.25 times the speed of sound. If a shock wave is felt 10 seconds after the plane flies overhead, what is the plane's altitude?

A boat produces water waves as it sails along a river. You notice that 13 waves hit the bank in 5.4 seconds. If distance between successive wave crests is 3.9 centimeters, how far would these waves travel in 31 seconds. Express your answer in centimeters to at least 3 significant figures.

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A group of hikers hears an echo 1.00 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 342 m/s.) m

An osprey’s call is a distinct whistle at 2200 Hz. An osprey calls while diving at you, to drive you away from her nest. You hear the call at 2300 Hz. How fast is the osprey approaching?

A train whistle is heard at 330 Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 320 Hz. What is the speed of the train before slowing down?Express your answer to two significant figures and include the appropriate units.What is the speed of the train after slowing down? Express your answer to two significant figures and include the appropriate units.

20. A bat navigates through ultrasonic beeps with a frequency of f the speed of sound towards a flat, stationary, wall, with what frequency does the bat hear the signal reflected from the wall? 40 kHz. If the bat is moving with a speed 0.040 times (1) 43 kHz (2) 40 kHz (3) 37 kHz (4) 34 kHz (5) 46 kHz

6. You measure the intensity level of a sound wave 6 cm from its source (treat as a point source), and the result is 84 dB. What is the intensity of this sound wave? Answer:

A group of hikers hears an echo 2.60 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 349 m/s.) m

A group of hikers hears an echo 1.10 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 345 m/s.) ?m