Question

A PT student is studying the effects and characteristics of ultrasound. Which of the following statements regarding therapeutic ultrasound is true?

Select one:
a. A 40% duty cycle would have an off time of 6msec and an on time of 4msec
b. A 40% duty cycle would have an off time of 10msec and an on time of 4 msec
c. A 40% duty cycle would have an off time of 4msec and an on time of 10msec
d. A 40% duty cycle would have an off time of 4msec and an on time of 6msec

Answer 1

A 40% duty cycle would have an off time of 10msec and an on time of 4msec.

Step-by-step explanation:

A 40% duty cycle would have an off time of 10msec and an on time of 4msec.

The duty cycle refers to the ratio of the on time to the total time of the ultrasound wave. In this case, the on time is 4msec and the off time is 10msec.

It is important to note that the duty cycle determines the intensity and heating effect of therapeutic ultrasound, so it is crucial to use the appropriate settings for different treatments.