Q.State any two applications of acoustics.

[!TLDR] Any two of: SONAR (underwater ranging), ultrasonic medical imaging, kidney-stone lithotripsy, auditorium design, animal echolocation, or noise control/geological sounding. [!ANSWER] E.g. (1) …

Acoustics -- the study of the production, transmission and reception of sound -- has applications well beyond everyday hearing. Two clear examples: (1) SONAR (SOund Navigation And Ranging), which locates underwater objects like submarines by transmitting an ultrasonic pulse and timing the delay before its reflected echo returns, giving the object's depth/range; (2) medical ultrasonic imaging, which uses reflected ultrasonic waves from structures inside the body for prenatal examination, detecting tumours or other abnormal growths, and studying heart-valve action. Other valid applications from the chapter include shock-wave lithotripsy (breaking kidney stones without surgery), the acoustic design of auditoriums (parab …

Recall the applications listed in section 8.7.3 (auditorium acoustics, medical, natural/animal, and 'other' -- SONAR, …

Naming a vague, undescribed 'use of sound' rather than a specific, named application from the chapter (SONAR, ultrasonic imaging, lithotripsy, echol …