Questions Uploads
Question
A sonic depth gauge is placed 3.0 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.014 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.)
(b)
How deep (in m) is the snow?
Question
Approximately how many times louder is a 150-dB
sound than a 70-dB
sound?
Question
In a student laboratory exercise, the wavelength of a 28,300 Hz ultrasound wave is measured to be 1.246 cm. Find the air temperature (in K).
Question
A steel cable with total length 26 m
and mass 120 kg
is connected to two poles. The tension in the cable is 3,217 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the cable
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