Question 5 (2 points) (04.03 MC)
Which types of changes must follow the law of conservation of mass? (2 points)
O a
Both physical and chemical changes
Ob
Neither physical nor chemical changes
Ос
Only physical changes
Od
Only chemical changes

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?