1.which of the following descriptions would be correct for someone playing a bas

Question

1.which of the following descriptions would be correct for someone playing a bass so softly you can barely hear it? a) low frequency, high amplitude b)low frequency, low amplitude c)high frequency, low amplitude d)high frequency, high amplitude 2.All of the following are acceptable units of frequency except: a)once per lifetime b)3 cycles per minute c)437 times d)36Hze)26 frames per seconds 3. for a 20z wave, what is the period (express using units of mill seconds)? 4. if the frequency decreases by a factor of 3 what change occurs to: a)period b)the propagation velocity c)wavelength d)amplitude 5. a factor of 16 in amplitude is equivalent to how many decibles? 6. explain why a factor of 4 in power is equivalent to a factor of 2 in amplitude 7. as the wavelength increases, the distance from a point in the tissue to the face of a transducer becomes a larger percentage, thereby causing the wave to go from constructive to destructive interference sooner. a)true b)false 8.if the transmit voltage is changed from 2 volts to 20 volts, what is the change in each of the following parameters? a)amplitude b)decibles c)power d)intensity 9.the lack of range specificity, referred to as _________ ___________ is the greatest limitation of continuous wave operation. 10. what would be more difficult to resolve, structures 0.05mm apart, or structures 500 milli meters apart? 11.give the equation for calculating the PRP. 12. what is the highest achievable axial resolution if the spatial pulse length is 12mm? 13.given a PRP of 10 msec, what is the PRF (express your answer using the unit Hz)?

Explanation / Answer

1) b)low frequency, low amplitude

2)a)once per lifetime

3)1/20 = 50 ms

4)a) period increases by a factor of 3 b) propagation velocity decreases by a factor of 3

c) wavelength no change d) Amplitude no change

5) dB = 20 log (16) =24.08

6) P is directly proportional to A^2 that is why the change

7)b)false

8)a) amplitude = 18V

b) db = 20

c) Power = 396

d) Intensity = 324

10)0.05 mm apart

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