The sound of normal breathing is not very loud, with an intensity of about 11 db at a distance of 1 m away from the face of the breather.
note that in this problem sound intensity in decibels is denoted β; intensity in w/m² is denoted i.
given that a person with normal hearing canbarely detect a sound with intensity of 1 db at a frequency of 1khz (the sensitivity of the human ear peaking near 1 khz), how faraway could this person detect another person breathingnormally?
express the distance in meters.
Answers: 2
Physics, 22.06.2019 06:30
Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.
Answers: 2
Physics, 22.06.2019 10:20
Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?
Answers: 1
Physics, 22.06.2019 18:00
What structural formula represents 4 electrons shared between two atoms?
Answers: 1
The sound of normal breathing is not very loud, with an intensity of about 11 db at a distance of 1...
Mathematics, 20.01.2021 23:40
Mathematics, 20.01.2021 23:40
Mathematics, 20.01.2021 23:40
History, 20.01.2021 23:40
Mathematics, 20.01.2021 23:40
Chemistry, 20.01.2021 23:40
Health, 20.01.2021 23:40
Chemistry, 20.01.2021 23:40
Mathematics, 20.01.2021 23:40