38. Which is NOT an acoustic variable?

36. All of the following relate to the strength of the sound wave except:

29. The prefix “centi” denotes:

42. What term is defined as “the power of a wave divided by the area over which the power is distributed?”

35. The DF for CW ultrasound is:

7. Pressure is typically expressed in

24. Which of the following is determined by the medium only?

Weil er seine Mathe falsch gerechnet hat, muss Daniel [1] Auto nach Istanbul.

Wo sind deine Hausaufgaben Calvin? Hat dein Tiger sie gefressen? Erzählst du [1] heute?

Likewise, compose two sentences using the two-way preposition “hinter”.