13 The faster the sound moves through the air, … Question 7The faster the sound moves through the air, …The colder the air must be.The warmer the air must be.The dryer the air must be.The higher frequency sound it must be.
14 B) The warmer the air must be ANSWERB) The warmer the air must be
15 Question 8 What is the range of human hearing? 5 Hz-5,000 Hz
53 Question 28One vacuum cleaner makes a sound of 93 decibels. How many decibels do four vacuum cleaners make?
54 Question 31A rocket engine emits 2.0 x105 Joules of sound energy per second. The sound is emitted in all directions. What is the sound intensity level, measured relative to the threshold of hearing, at a distance of 85 m away?