A sonic depth gauge is placed 5.4 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.031 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?

A sonic depth gauge is placed 5.4 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.029 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 sonic depth gauge is placed 4.5 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.023 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

High-intensity focused ultrasound (HIFU) is one treatment for certain types of cancer. During the procedure, a narrow beam of high-intensity ultrasound is focused on the tumor, raising its temperature to nearly 90 °C and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 3.10 MHz produced an intensity of 1425.0 W/cm². The energy was delivered in short pulses for a total time of 2.60 s over an area measuring 1.20 mm by 5.30 mm. The speed of sound in the soft tissue was 1570 m/s, and the density of that tissue was 1492.0 kg/m³. What was the wavelength of the ultrasound beam? How much energy Etotal was delivered to the tissue during the 2.60 s treatment? What was the maximum displacement A of the molecules in the tissue as the beam passed through? λ = Etotal A = = 5.06 X10-4 5.8 ×10¹2 Incorrect 3.15 x10-7 Incorrect m m

Two progressive waves y (x, t) = A sin( 4 x – ot) and y2(x, t) = A sin(4x - - - ) travel in the same direction. Calculate the speed of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 = 4 m and w = 31.4 Hz. Provide your answer in Sl units.

Two progressive waves yj = A sin( 4 x - ot) and y2 = A sin( 2" x – ot – 5) travel in the same direction. Calculate the velocity of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 =8.7 m and w =12.7 rad/s (radian per second). Give your answer in Sl units.

A sonic depth gauge is placed 4.9 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.026 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

You hear a song from your playlist you haven't heard in a while and it warrants you to commence singing.  As you are sing, the power of the compression wave you create is approximately 297.02 nW (note, nW is nano-Watts).  What is the intensity of this sound as measured by your roommate who is standing 6.04m from you?  Please give your answer in units of nW/m2.  This unit is not a common one.  Usually, the unit would simply be Watts per square-meter (which would be your answer divided by a million!).  This goes to show you that are ears are amazingly sensitive to very tiny sound intensities.  Note: Intensity was a topic covered in section 11.1, and I will provide the formula: I = P / A where P is the power in units of Watts, and A is the surface area of a sphere of radius "L" (in this problem).