Ultrasound can be used to deliver energy to tissues for therapy. It can penetrate tissue to a depth approximately 200 times its wavelength. What is the approximate depth of penetration of ultrasound at a frequency of 5.0 MHz?A. 0.29 mm           B. 1.4 cm           C. 6.2 cm           D. 17 cm

A room is at standard 20 cels. a) What wavelength does a 1.11 million Hz ultrasound passes through human tissue? Be sure to use the speed of these waves in human tissue (1540m/s). b) How many waves are passing through the human tissue in 1 second? c) The ultrasound session lasts 5 minutes. How many waves passed through the human tissue during this timeframe? d) Which example best describes this type of wave -- water, light, spring, sonic boom, pulse, pulse wave packet? Explain your answer.

As you are stopped for a traffic light an ambulance approaches you with a speed of 17 m/s. The ambulance's siren is emitting a sound wave with a frequency of 950 Hz. Consider the speed of sound to be 340 m/s and compute the frequency of the sound you hear. A.950 Hz B.1000 Hz C.1050 Hz D.1100 Hz E.1150 Hz

Which of the following statements are true? Which one or more? a.   The pitch of the voice is affected by the amplitude of vibration of the vocal cords, but not by frequency dependent acoustic resonance.  b. D The low frequency range which contains the consonants is more important for understanding speech than the high frequency range from about 1 k Hz to 5 k Hz which contains the vowels.  c.   The high frequency range from about 1 k Hz to 5 k Hz which contains the consonants is more important for understanding speech than the low frequency range which contains the vowels.  d.   The pitch of speech sounds is produced by articulation or movement of the tongue, lips, lower jaw and soft palate to modify the airflow.

A car moving at 20 m/s with its horn blowing (f = 1.2 kHz) is chasing another car going at 15 m/s. What is the apparent ffrequency of the horn as heard by the driver being chased? Take the speed of sound to be 340 m/s. A. 1331.25 kHz B. 1218.75 Khz C. 1083.33 kHz D. 1183.33 kHz