While testing speakers for a concert, tomás sets up two speakers to produce sound waves at the same frequency, which is between 100 hz and 150 hz. the two speakers vibrate in phase with each other. he notices that when he listens at certain locations, the sound is very soft (a minimum intensity compared to nearby points). one such point is 26.2 m from one speaker and 37.3 m from the other. (the speed of sound in air is 343 m/s.)

it takes about 30 days for it to break down

increase masses, decrease separation

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.