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?

Question 1 what is amperage? is the rate of doing work. is the rate of flow of protons in electric current. represents the amount of pressure behind electron flow. is the rate of flow of electrons in electric current. 2 points question 2 what is voltage? is the rate of doing power. represents the amount of pressure behind electron flow. is the rate of doing work. is the rate of flow of electrons in electric current. 2 points question 3 what is power? is the rate of flow of protons in electric current. is the rate of flow of electrons in electric current. is the rate of doing work. represents the amount of pressure behind electron flow. 2 points question 4 if we multiply volts times amps we get what? power circuit work current 2 points question 5 what are two ways alternating currents are similiar? in both ac and dc electrons flow in the same pattern. in both ac and dc, the flow of electrons changes directions back and forth. both ac and dc are only possible in certain materials with atoms that will allow electron flow. both ac and dc involve the flow of electrons. 4 points question 6 how does the flow of electrons flow in an alternating current? the flow of electrons is always slower in an alternating current than within a direct current. the flow of electrons is not constant and forward; it changes direction back and forth. electrons flow from from a higher affinity to that of a lower affinity. electron flow is constant and only in a forward direction. 2 points question 7 what is the flow like in a direct current? the flow of electrons is not constant and forward; it changes direction back and forth. the flow of electrons is constant and only in a forward direction. the flow of electrons go from a higher affinity to a lower affinity. the flow of electrons are always faster in a direct current. 2 points question 8 how is an electric current able to flow? electrons flow from the higher affinity to lower affinity and electrical current is generated. protons flow from the higher affinity to lower affinity and electrical current is generated. the movement of protons from one atom to another leads to an electric charge. the movement of electrons from one atom to another atom in a line results in a flow of electric current. 2 points question 9 how do electrons move from the two different types of metal in a battery? protons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated. protons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.