Physics

posted by .

A microphone has an area of 3.8 cm2. It receives during a 2.87 s time period a sound energy of 4.2x10-11 J. What is the intensity of the sound?

  • Physics -

    (Sound Intensity) = (Energy)/[(Area)*(Time)]

    It can be converted to decibels using a logarithmic formula, if that is what they want.

  • Physics -

    How would I do that?

  • Physics -

    Do the indicated division first, to get 3.85*10^-8 W/m^2

    Zero dB corresponds to 10^-12 W/m^2

    Each factor of ten in intensity above the zero dB reference level corresponds to a 10 dB increase.

    I get 46 dB for your case

    See http://www.animations.physics.unsw.edu.au/jw/dB.htm
    for a better explanation

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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?
  2. PHYSICS

    A concert loudspeaker suspended high off the ground emits 35 W of sound power. A small microphone with a 1.0 cm2 area is 50 m from the speaker. (a) What is the sound intensity at the position of the microphone?
  3. 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 …
  4. Physics

    A microphone has an area of 3.8 cm2. It receives during a 2.87 s time period a sound energy of 4.2x10-11 J. What is the intensity of the sound?
  5. Physics

    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?
  6. 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?
  7. 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?
  8. 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?
  9. 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 …
  10. 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?

More Similar Questions