1 The region of high pressure in a sound wave is called: A Rarefaction B Compression C Amplitude D Frequency
5 Ultrasound is commonly used in: A Radio transmission B Medical imaging C Heating devices D Lighting systems
6 The distance between two consecutive compressions is called: A Amplitude B Frequency C Wavelength D Pitch
8 In acoustics, absorption of sound is increased by: A Hard surfaces B Smooth walls C Soft materials D Metal sheets