Question

An ultrasound machine in a hospital uses a sound source at 5.10000MHz. Assuming that the speed...

An ultrasound machine in a hospital uses a sound source at 5.10000MHz.

  1. Assuming that the speed of the ultrasound in the body is same as water (1440 m/s), determine the wavelength in the body.
  2. 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?
  3. What is the frequency of the sound waves reflected back towards the source by the blood cells?
  4. If the sound level intensity is 2.0 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).
  5. 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?
Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
An ultrasound machine in a hospital uses a sound source at 19.00000MHz. [3 marks] Assuming that...
An ultrasound machine in a hospital uses a sound source at 19.00000MHz. [3 marks] Assuming that the speed of the ultrasound in the body is same as water (1440 m/s), determine the wavelength in the body. [6 marks] 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? [5 marks] What is the frequency of the sound waves reflected back...
The sound intensity level of 0 dB is defined as the threshold for hearing value of...
The sound intensity level of 0 dB is defined as the threshold for hearing value of I0 = 10-12 W/m2. a) What is the sound intensity (in W.m-2) for a sound level of 46 dB? b) The intensity of sound emitted from a point source decreases with the square of the distance according I2 = I1.(d1/d2)2. Given that the sound level intensity of 46 dB is obtained at a point d1 = 6.8 cm from a source, at what distance...
Doppler ultrasound is used to measure the speed of blood flow. The reflected sound interferes with...
Doppler ultrasound is used to measure the speed of blood flow. The reflected sound interferes with the emitted sound, producing beats. If the speed of red blood cells is 0.100 m/s, the ultrasound frequency used is 3.80 MHz, and the speed of sound in blood is 1570 m/s, what is the beat frequency? If the speed of the red blood cells is v, the speed of sound in blood is u, the ultrasound source emits waves of frequency f, and...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 117...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 117 W. (a) Find the intensity 11.0 m from the source. W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experience the sound at the threshold of pain, 120 dB? m
The sound from a busy highway contains a 500 Hz Fourier component whose power at the...
The sound from a busy highway contains a 500 Hz Fourier component whose power at the highway is 1.5 ✕ 10−6 watt/m. (Ignore sound interactions with the ground). (a) What are the sound intensity (in W/m2),the sound intensity level (in dB) and the loudness (in phon) of that Fourier component at a distance of 57 m from the highway? intensity W/m2 intensity level dB loudness phon (b) What are the sound intensity (in W/m2), the sound intensity level (in dB)...
At a particular site, you notice that the sound intensity and the sound intensity level from...
At a particular site, you notice that the sound intensity and the sound intensity level from a source are respectively I1 and β1. You then ask the sound crew to increase the sound until the sound intensity level (in dB) doubles and the sound intensity (in W/m2) quadruples. Determine the sound intensity level of the initial sound at your site..
The sound intensity levels for a machine shop and a quiet library are 85 dB and...
The sound intensity levels for a machine shop and a quiet library are 85 dB and 38 dB, respectively. What is the difference between the intensity of the sound in the machine shop and that in the library? At a distance of 11.0 m from a point source, the intensity level is measured to be 75 dB. At what distance from the source will the intensity level be 37.5 dB?
A sound point source, situated 1.8 m above a brick floor, is emitting sound at 5...
A sound point source, situated 1.8 m above a brick floor, is emitting sound at 5 ✕ 10−5 watts. (a) Find the sound intensity level (in dB) due to that source at a listening point 3.2 m above the floor and 14 m away. (Assume that 14 m is the horizontal distance between the sound point source and the listening point. Do not take reflection from the floor into account.) dB (b) Find the sound intensity level (in dB) at...
14.5 When the volume knob is turned up, the sound level changes from 50 dB to...
14.5 When the volume knob is turned up, the sound level changes from 50 dB to 87 dB. What is the ratio of the intensities in W/m2 ? 14.6 If the sound intensity level in decibels at a location 42 m from a spherical source is 37 dB, what is the power output of the source?
What is the intensity level of a sound with an intensity of 3.5 x 10-8 W/m2?...
What is the intensity level of a sound with an intensity of 3.5 x 10-8 W/m2? 35.4 dB 49.1 dB 45.4 dB 13.4 dB Two cellos are being played in a duet. At a certain point, one cello plays a note of frequency 196 Hz and the other plays a note of frequency 220 Hz. What is the period of the beat? 0.4 s 4 s 0.25 s 0.1 s
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT