In old western movies, cowboys often would put their ear to a train track to listen for an oncoming train. what benefit would this method provide over listening for a train by listening for sound through the air?
a) the sound would be louder.
b) the sound would be undistorted.
c) the sound would reach him sooner.
d) the sound would higher in frequency.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.