Sound intensity assignment
Due: Sunday 29/3/2020
Q1) Calculate the intensity of the sound waves from an electric guitar’s amplifier at a distance of 5 m when its power output is equal to each of the following values:
a. 0.25 W
b. 2 W
Q2) When the decibel level of traffic in the street goes from 40 to 60 dB, how much greater is the intensity of noise?

Q3) An intensity of 1.0 X 10-1 w/m2 can cause damage to the ears. If the power of sound from a rock band’s amplifier is 85 w, how far are you standing from the speaker if you are damaging your ears?

Q4) Point A and B located at 4 meters and 9 meters from a source of the sound. If IA and IB are intensity at point A and point B, then find IA : IB

Q5) The intensity of a source of sound is 10−9 Wm−2. Io = 10−12 Wm−2. What is the sound level of 10 sources of sounds?

Q6) The sound level of a source of sound is 10 dB. What is the intensity of 1000 sources of sound?

Q7) If point P is the source of sound, then what is the ratio of sound intensity at points S, R, and Q ?

Q8) The sound intensity of a source of sound is 6 x 10-6 W/cm2. If the sound intensity level increased by 10 db, determine the intensity of sound.
Q9) An 4-hour exposure to a sound intensity level of 110.0 dB may cause hearing damage. What energy in joules falls on a 0.800-cm-diameter eardrum so exposed?
Q10)A microphone in the ocean is sensitive to sounds emitted by porpoises. To produce a
usable signal, sound waves striking the microphone must have an intensity of 10 dB. If porpoises emit sound waves with a power 0.05 W, how far can a porpoise be from the microphone and still be heard?