When lisa placed a balloon to her ear, she was able to hear what her sister was whispering from the other side of the room. when she removed the balloon, she was no longer able to hear what her sister was saying. what is the best explanation for what lisa discovered?
a) the material from which the balloon is made makes sounds seem louder.
b) there is no air pressure inside the balloon, which makes sound waves travel more quickly.
c) the air in the balloon is not as dense as the air outside the balloon, which makes sound waves echo.
d) sound does not travel around the air outside of the balloon as well as it does through the denser air pressure inside the balloon.

neither accurate nor precise.

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.