A sonic depth gauge is placed 4.6 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.024 seconds after it was emitted. The air temperature is −20°C. (a) How far (in m) is the surface of the snow from the device? (Round your answer to at least three significant figures.)   m (b) How deep (in m) is the snow?   m       A person stands directly in front of two speakers that are emitting the same pure tone. The person then moves to one side until no sound is heard. At that point, the person is 4.15 m from one of the speakers and 4.17 m from the other. What is the frequency (in Hz) of the tone being emitted? (Assume air temperature to be 20°C.)

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Chapter1: Units, Trigonometry. And Vectors
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A sonic depth gauge is placed 4.6 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.024 seconds after it was emitted. The air temperature is −20°C.
(a)
How far (in m) is the surface of the snow from the device? (Round your answer to at least three significant figures.)
  m
(b)
How deep (in m) is the snow?
  m
 
 
 
A person stands directly in front of two speakers that are emitting the same pure tone. The person then moves to one side until no sound is heard. At that point, the person is 4.15 m from one of the speakers and 4.17 m from the other. What is the frequency (in Hz) of the tone being emitted? (Assume air temperature to be 20°C.)
 
 
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