1. Physics

    Hearing damage may occur when a person is exposed to a sound intensity level of 90.0 dB (relative to the threshold of hearing) for a period of 9.0 hours. One particular eardrum has an area of 1.90 10-4 m2. How much sound energy is incident on this eardrum
  2. PHYSICS

    When a person wears a hearing aid, the sound intensity level increases by 35 dB. By what factor does the sound intensity increase?
  3. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
  4. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
  5. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
  6. Physics - Please Help

    A 60 year old person has a threshold of hearing of 81.0 dB for a sound with frequency f=10,000 Hz. By what factor must the intensity of a sound wave of that frequency, audible to a typical young adult, (sound level=43.0 dB) be increased so that it is heard
  7. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed? I try to use k = IAT = (1*10^-3)(0.0085^2)(8*3600)=0.00208 but answer is not correct.
  8. physics

    Factory Worker A is exposed to a sound of a constant intensity of 6.30 × 10–4 W m–2 at a distance of 1.00 m from a noisy machine. The frequency of the sound is 4.00 kHz. (a) What is the sound level in decibels (dB) of this sound? (b) By what factor
  9. physics - sound level

    The source of a sound wave has a power of 2.50 µW. Assume it is a point source. (a) What is the intensity 6.70 m away? I used I = Power / 4*pi*r^2 and found I to be 4.43x10^-9 W/m^2 (b) What is the sound level at that distance? Sound level = 10 dB*log
  10. physics

    An audio speaker at a concert emits sound uniformly in all directions at a rate of 100 W. (i) Calculate the sound intensity experienced by a listener at a distance of 8 m from the speaker. The listener moves back from the speaker to protect her hearing.
  11. Physics

    The ability to hear a “pin drop” is the sign of sensitive hearing. Suppose a 0.55-g pin is dropped from a height of 28 cm, and that the pin emits sound for 1.5s when it lands. Assuming all of the mechanical energy of the pin is converted to sound
  12. physics

    Sound is passing perpendicularly through an open window whose dimensions are 1.1 m  0.75 m. The sound intensity level is 95 dB above the threshold of hearing. How much sound energy comes through the window in one hour?
  13. physics

    Sound is passing perpendicularly through an open window whose dimensions are 1.1 m x 0.75 m. The sound intensity level is 71 dB above the threshold of human hearing. How much sound energy comes through the window in one hour?
  14. Physics

    This time I have two questions: #1.A recording engineer works in a soundproofed room that is 49.7 dB quieter than the outside. If the sound intensity in the room is 2.66 x 10-10 W/m2, what is the intensity outside? #2.A listener increases his distance from
  15. Math

    Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the power of 12) where I is the intensity of sound in watts per square metre. a) Find the number of decibels of sound produced by a jet
  16. Physics(Please help)

    The intensity (in W/m2) of one sound is 4.83 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level â of the louder sound? I am not sure how to start this. Thank you.
  17. physics

    Suppose a person is going to be exposed to a steady tone of frequency 8000 Hz all night (perhaps arising from noisy electronics in a nearby room. ) If this person wants their perceived room loudness level to be a very quiet 10 phon (in order to sleep
  18. physics

    A person standing 1.00 m from a portable speaker hears its sound at an intensity of 7.50  103 W/m2. (a) Find the corresponding decibel level. (b) Find the sound intensity at a distance of 35.0 m, assuming the sound propagates as a spherical wave. (c)
  19. Physics

    The intensity due to a number of indipendent sound sources is the sum of the individual intensities. A) When four quadruplets cry simultaneously, how many decibels greater is the sound intensity level than when a single one cries? B) To increase the sound
  20. Physics

    I'm not sure how to calculate this question help me! (Grade 11 Physics) it's sound intensity... Show me how to do it please! (textbook says answer is 3.5 m) At close proximity, rustling leaves have a sound intensity of about 1.2 x 10^-11 W/m squared. At
  21. Grade 12 Math Please help!!

    Please can anyone answer this which I have posted previously? Anyone with knowledge of this area of maths? Thanks in anticipation. :) Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the
  22. Reading Comp.

    The modern hearing aid is, essentially, a miniature public-address system, which converts sound into electrical energy and then converts it back to sound again. A hearing aid can increase the sound level by sixty decibels or more, but it also distorts the
  23. Math

    At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 W/m^2. a) The sound
  24. Math

    At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 W/m^2. a) The sound
  25. physics

    1.) The average sound intensity inside a busy neighborhood restaurant is 3.*10^-5 W/M^2. How much energy goes into each ear (area = 2.1 * 10^-2 m^2) during a one hour meal? 2.) A member of an aircraft maintenance crew wears protective earplugs that reduce
  26. Physics- Elena please help!

    An interstate highway has been built though a poor neighborhood in a city. In the afternoon, the sound level in a rented room is 114.0 dB as 172 cars pass outside the window every minute. (a) What is the sound intensity during the day ? (Reminder: If you
  27. statistics

    Hearing levels or cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. Noise level is described as Low=under 88 decibels, Medium=88-91 decibels, High=92^decibels. At a = .05, is the cockpit noise
  28. Hearing Loss/Causes

    I need websites on these Questions: How does a buildup of earwax cause someone to have a hearing loss? What happens when there is hearing loss in the inner ear? What are some reasons that a person may have a hearing loss in the outer or middle ear? What is
  29. @Ms.Sue please help!!:(Math

    Sound intensity is inversely proportional to the square of the distance from the sound source; that is I= k/ (r)^(2), where I is the intensity, r is the distance from the sound source, and k is a constant. Suppose that you are sitting a distance R from the
  30. physics

    the intensity level of a sound A is5dB greater than that of sound B and 3dB less than that of C. determine the ratio (Ic/Ib) of the intensity of sound C to that of sound B.
  31. physics

    An electronic point source emits sound isotropically at a frequency of 3000 Hz and a power of 34 watts. A small microphone has an area of 0.75 cm2 and is located 158 meters from the point source. a) What is the sound intensity at the microphone ? To find
  32. Physics

    Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the
  33. Physics

    Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the
  34. Physics

    1.The mass of a string is , and it is stretched so that the tension in it is 180 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string? 2.A rocket engine emits of sound energy
  35. math

    A loud speaker at a rock concert generates 102 W/m2 at 20m with a frequency of 1 kHz. Assume that the speaker spreads its intensity uniformly in all direction. (a) What is the sound level ( = ?) at 20 m? (b) What is the total acoustic power output of
  36. LOGS

    The decibel level of a sound is given by dB=10log(EE0), where E0=10−12wattsm2 and E is the intensity of the sound. (a) Find the intensity of a 80-decibel sound. E= watts per square meter. (b) How many times more intense is the sound from (a) than a
  37. physics

    I have a few questions that i am not too sure how to figure out... 1- as a racing car zooms by you, its pitch decreases by 20%. If the speed of sound is 345m/s, how fast is the car travelling? 2-a person has a threshold of hearing of 5db. another person
  38. Physics

    1.The mass of a string is , and it is stretched so that the tension in it is 180 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string? 2.A rocket engine emits of sound energy
  39. PHYSICS

    The intensity level of a sound is reported in unit decibel(dB). how does IL change if we increase a sound intensity by a factor of 10? a)remains the same b) increases by 1dB to 2dB c)it increases by 2dB to 20dB d)it increases by 20dB to 200dB e) it
  40. Physics Please check my answers

    A sound of 7 kHz frequency is well within the normal hearing range of most people. True. False.
  41. Math

    You are attending a loud concert. To avoid ear damage, you decide to move father from the stage. Sound intensity is given by the formula I= k/d2, where k is the constant and d is the distance in meters form the listener to the source of the sound.
  42. Grade 11 Math

    Here's the question: You are attending a very loud concert. To avoid permanent ear damage, you decide to move farther from the stage. Sound intensity is given by the formula: I = k/d squared K= constant D = distance from the listener to the source of
  43. physics

    A student in the front row of a concert is at a distance of 2 m from the speaker. They hear the sound at 140dB. What is the sound intensity if the student walks 20 m away. What is the sound intensity at 2 m if there are 100 speakers at the same level at
  44. physics

    1.The mass of a string is , and it is stretched so that the tension in it is 180 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string? 2.A rocket engine emits of sound energy
  45. Precalculus(NEED HELP ASAP PLEASE!!)

    NEED HELP ASAP PLEASE!! A high sound level of 120 dB is regarded as the threshold of pain for the average listener. If the threshold of hearing is 10^−12 watts/m^2, then the intensity of the sound corresponding to 120 dB is ____________ watts/m^2.
  46. Physics

    The amplitude of a sinusoidal sound wave is quadrupled. a) By which factor is its intensity multiplied? b)By how many decibels does the sound intensity level increase?
  47. Maths

    Mathew is attending a very loud concert by the discarded. To avoid permanent ear damage he decides to move farther from the stage. Sound intensity is given by the formula I=k/d*d where k is the constant and d is the distance in metres from the listener to
  48. physics

    A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 355. When a jet aircraft is taking off, the sound intensity level experienced by the crew member is 72 dB. What sound intensity level would
  49. Physics

    A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97
  50. Physics

    A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97
  51. Physics

    A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97
  52. Physics

    1. What is the intensity of a sound at the pain level of 120 dB? 2. What is the intensity level of a sound whose intensity is 2.0 x 10^-6 W/m^2?
  53. algebra 2

    THe loudness L of a sound is measured by L=10 log10^R where R is the sound's relative intensity. One person talks with a relative intensity of 10^6 or 60 decibels. How much louder would 100 people be ,talking with the same intensity. So would I just use L=
  54. Physics

    As measured from centre ice, a single wildly cheering hockey fan can produce a sound intensity level of 60dB. What sound intensity level would be produced by 20 000 cheering fans? --------- If sound waves travel through the ground with an average speed of
  55. STUPID PHYSICS

    As measured from centre ice, a single wildly cheering hockey fan can produce a sound intensity level of 60dB. What sound intensity level would be produced by 20 000 cheering fans? --------- If sound waves travel through the ground with an average speed of
  56. Grade 12 Advanced Functions Math

    Hello! Can someone please help me out for this question? The loudness, L, of a sound in decibels can be calculated using the formula L= 10 log(I/ F) where I is the intensity of the sound in watts per square metre and F= 10^ -12 . A singer is performing to
  57. PreCalculas

    The psychological sensation of loudness B is measured in decibels and is defined with reference to the intensity, , of a barely audible sound by the following equation. In this equation, I is the intensity of the sound in question. B=10log 1/1o If the
  58. Math

    The sound intensity of a soft whisper is about 1/200000 of the sound intensity of a shout. What is the decibel level of a whisper if a shout has a loudness level of about 85 dB? L = 10log(i1/10^-12)
  59. Precalculus

    I have posted this question earlier as well but was unable to receive an answer. I don't know how to do this question at all, so PLEASE help me with this question and also show me the steps, so that I can learn. I would appreciate it a lot. A high sound
  60. physics

    At a distance of 7.5 m from a point sound source, the sound intensity level is 105 dB. At what distance is the intensity level 90 dB?
  61. SCIENCE

    The intensity level of sound A is 5.0dB greater than that of sound B and 3.0dB less than that of C. Determine the ratio(Ic/Ib) of the intensity of sound C to that of B.
  62. Physics

    A fan at a rock concert is 45.0 m from the stage, and at this point the sound intensity level is 108 dB. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate . Typically, the diameter of this membrane is about 8.40 m in
  63. physics

    1) Sound propagating through air at 30 degree Celsius passes through a vertical cold front into air that is 40 degree Celsius. If the sound has a frequency of 2400 Hz, by what percentage does its wavelength change in crossing the boundary? (2) What is the
  64. Math!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    The sound intensity of a rainfall is 4.5×10^-9 W/m^2. Find the corresponding sound intensity level.
  65. physics

    NEED HELP WITH ONLY PART C Two 135.1.0-W speakers, A and B, are separated by a distance D = 3.6 m. The speakers emit in-phase sound waves at a frequency f = 11800.0 Hz. Point P1 is located at x1= 4.50 m and y1 = 0 m; point P2 is located at x2 = 4.50 m and
  66. Physics

    There is a band who uses 10000 W to radiate sound energy in all directions. What was the intensity of sound 10 meters from this speaker? What was the sound level in dB at a distance of 10 m? At what distance from the speaker was the sound level 100 dB?
  67. alg 2

    The sound level in decibles, B, can be found using the equation B=10 log(I/10^-12). what is the sound intensity when the decible level is 90? pleaseeeeeeeeeeee helppppppppppppppppppp
  68. physics

    A bell is rung at a sound intensity of 70dB . A trumpet is blown at an intensity that is greater by a factor of 10^3. What is the intensity level of the trumpet
  69. physics

    A grade-school teacher insists that the the overall sound level in his classroom not exceed 64 dB at his location. There are 25 students in his class. If each student talks at the same intensity level, and they all talk at once, what is the highest sound
  70. Physics

    Your stereo is set to a sound intensity level (SIL) of 60 dB. I'd like to know what this means in terms of energy flow: what is the intensity of the sound wave this produces? Compute your answer in W/m2, but do not enter units. So in my problem it would be
  71. PHYSICS

    An amplified guitar has a sound intensity level that is 11 dB greater than the same unamplified sound. What is the ratio of the amplified intensity to the unamplified intensity?
  72. physics

    The sound intensity level at a concert increases from 85 dB to 94 dB when the concert begins. By what factor has the sound intensity increased?
  73. Physics

    1) A microphone has an area of 6.7 cm2. It receives during a 4.62 s time period a sound energy of 2.5x10-11 J. What is the intensity of the sound? 2) Using the intensity in the previous question, what is the variation of pressure in the sound wave if the
  74. Physics

    1) A microphone has an area of 6.7 cm2. It receives during a 4.62 s time period a sound energy of 2.5x10-11 J. What is the intensity of the sound? 2) Using the intensity in the previous question, what is the variation of pressure in the sound wave if the
  75. Physics

    1) A microphone has an area of 6.7 cm2. It receives during a 4.62 s time period a sound energy of 2.5x10-11 J. What is the intensity of the sound? 2) Using the intensity in the previous question, what is the variation of pressure in the sound wave if the
  76. physics

    A stereo speaker emits sound waves with a power output of 100W. (a) find the intensity 10.0m from the source. B) find the intensity level in decibels, at this distance. C) at what distance would you experience the sound at the threshold of pain,120dB?
  77. physics

    What is the sound intensity level in decibels of ultrasound of intensity 10^5 W/m2, used to pulverize tissue during surgery
  78. physics

    A faint sound with an intensity of 10 -9 W/m2 is measured by an intensity-level meter. What will the reading be in dB?
  79. Physics - sound

    When wearing proper ear protection, a jack hammer operator experiences a sound intensity of 1x10^-6 W/m2. The ear protection purpots to reduce the sound intensity by 100 times. What is the actual sound level of the jack hammer?
  80. physics

    what is the sound intensity level in decibels of ultrasound of intensity of 105 w/m2, used to pulverize tissue during surgery
  81. physics

    What sound intensity level in dB is produced by earphones that create an intensity of 4.00¡¿10^-2 W/m^2?
  82. Physics

    Elephants communicate via infrasound, at frequencies as low as 11 Hz that can travel up to 9 km. The intensity of these sounds can reach 106 dB, measured a distance of 4 m from the source. a) Determine the intensity level in W/m2 of the infrasound at 4 m
  83. science (physics)

    1) Why is frequency an element needed in the sound industry? and 2) When there is a sound pressure level of two different sources with different frequencies, why do sound pressure levels have to be determined in each separate frequency? 1) The sound
  84. physics

    1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
  85. physics repost

    1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
  86. physics sound

    1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
  87. Physics

    This question has me very lost. Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 11 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a
  88. physics ..PLEASE HELP ASSIGN DUE SOON :(

    A microphone has an area of 3.0cm^2. It receives during a 6.00s time period a sound energy of 1.0x10-11J. What is the intensity of the sound? b). Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed
  89. Physics-just oen more time, please

    The sound intensity at a certain distance from a car is 2*10^-7 W/m^2. - If the distance is tripled, what is the new intensity of the sounds? - if the distance is halved, what is the new intensity of the sound? for the first question I tried doing
  90. Physics

    Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 35.9cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 109.1cm. What is the
  91. Algebra

    The Occupational Safety and health Administration (OSHA) estblished permissible sound exposures in the work-place. This is modeled by the equation: S=-2.817H + 108.9 Use the formula for the problem: S=maximun permissible sound level in decibels H=number of
  92. Algebra

    The Occupational Safety and health Administration (OSHA) estblished permissible sound exposures in the work-place. This is modeled by the equation: S=-2.817H + 108.9 Use the formula for the problem: S=maximun permissible sound level in decibels H=number of
  93. Physics

    We're in class with a SIL decibel meter up front, and everyone is screaming at the top of their lungs, hooting and shouting and pounding on their desks, shooting off firecrackers, its Phys 1240 gone wild...and the meter is reading a reasonably steady sound
  94. alg

    Sound intensity (loudness) varies inversely as the square of the distance from the source. If a rock band has a sound intensity of 100 decibels 25 feet away from the amplifier, find the sound intensity 50 feet away from the amplifier.
  95. algebra 2

    the loudness L of a sound in decibels is given L=10log10R, where R is the sound's relative intensity. if the intensity of a certain sound is tripled, by how many decibels does the sound increase? due tomorrow, tuesday,
  96. physics

    Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 14.0 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 54.0 cm. What is the
  97. physics

    Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 14.0 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 54.0 cm. What is the
  98. physics

    Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 14.0 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 54.0 cm. What is the
  99. Physics

    A speaker at an open-air concert emits 600 of sound power, radiated equally in all directions. a)What is the intensity of the sound 7.00 from of the speaker? I =0.974 W/m^2 b) What sound intensity level would you experience there if you did not have any
  100. Physics

    a) A microphone has an area of 5cm^2. It receives during a 4.0 s time period a sound energy of 2.0*10^-11 J. What is the intensity of the sound? b) using intensity from a) what is the variation in pressure in the sound wave, delta P ? Use T=293 K and