An ultrasound machine in a hospital uses a sound source at 19.00000MHz. Assuming that the speed...

An ultrasound machine in a hospital uses a sound source at 19.00000MHz.

Assuming that the speed of the ultrasound in the body is same as water (1440 m/s), determine the wavelength in the body.
If blood cells are moving towards the sound source at a speed of 0.8 m/s, at what frequency do the crests of the sound wave pass through the blood cell?
What is the frequency of the sound waves reflected back towards the source by the blood cells?
1. If the sound level intensity is 17.0 dB at a point d₁ = 6.8 cm from the source, what is the sound intensity at that point in W/m². (We can assume that 0 dB is referenced to 10^-12 W/m²).
2. Assume that sound is emitted from a point source, so that the intensity decreases quadratically with distance. What is the intensity level in dB at a point d₂ = 2.0cm from the source?

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genius_generous answered 1 year ago

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