When the maximum imaging depth decreases, what happens to the PRF?

Why is there a combination of intensities in ultrasound beam space, listening time, and the pulse duration?

6MHZ equal to —-HZ.

What is the wavelength (in mm) if the sound is traveling in the soft tissue with the frequency 5MHZ?

Early American blues music develops from emotional folk music called __________, which were lyrical songs sung by enslaved Africans that describe Christian bible narratives and the rewards of the afterlife. 

__________ was a famed musician and composer who helped bring classical Indian music to western popularity.

One benefit of theater according to ancient Greek philosophers like Aristotle was __________, which refers to the purging of emotions through dramatic arts.  

When music is set to narratives (like operas, musical theater, and film) composers sometimes use a __________, a specific musical theme associated with a particular object, character, or narrative theme. 

In literary works, the __________ is the principal character or force opposing the protagonist. 

Which of the following is the correct definition of Theater?