exam 1 physics 1

Match the following with its typical value

• 0.01-300 W/cm2

• intensity

• 1540m/sec

• period

• 2-15MHz

• frequency

• 0.1-0.8mm

• wavelength

• 0.06-0.5µsec

• propagation speed

A wave’s intensity is 4 mW/cm². There is a change of +9 db. What is the final intensit

• 8 mW/cm²

•  16 mW/cm²

•  32 mW/cm²

• 84 mW/cm²

Which of the following are determined ONLY by the sound source and can NOT be changed by the sonographer

• wavelength, propagation speed

•  period, frequency

• power, amplitude, intensity

•  period, frequency, wavelength

Of the four waves whose frequencies are listed below, which has the shortest period?

• 12 kHz

•  6,000 Hz

•  205 Hz

•  

  1 kHz

A pair of waves are considered ________ when their peaks occur at the same time and at the same location

• out-phase waves

• in-phase waves 

• absent

• interference

For the following questions, choose the best relationship:

• unchanged

• If you increase power, propagation speed

• increases

• If you increase frequency, wavelength

• • - unchanged

• If you increase beam area, intensity

• • - decreases

• If you decrease beam area, intensity

• • decreases

• If you decrease amplitude, propagation speed

How are duty factor and PRF related

• directly

•  inversely

•  unrelated

•  depends on PRP

On the waves represented below, which wave will have the slowest propagation speed through soft tissue

• Wave A

•  Wave B

•  Both A and B have the same propagation speed

•  Cannot be determined

What are the acoustic parameters that describe sound waves

• period

• amplitude & power

• intensity & wavelength

• propagation speed

• frequency

What is the reciprocal of 1/8

•  80/1

•  0.125

•  8/1

•  80.1