Physics

A loudspeaker emits energy equally in all directions at the rate of 1.75J/s. What is the intensity level at a distance of 15 m?

  1. πŸ‘ 0
  2. πŸ‘Ž 0
  3. πŸ‘ 64
asked by Piyanshu

  1. surface area of sphere = 4 pi r^2

    Watts/unit area at 15 m = 1.75/(4*pi*225)

    1. πŸ‘ 0
    2. πŸ‘Ž 0
    posted by Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    Hi guys, I was just wondering if I'm heading in the right direction with this question. Thank you so much in advance for your time!! A loudspeaker emits energy at the rate of 56W , spread in all directions. What is the intensity

    asked by Kylie on March 10, 2015

  2. Physics

    A loud speaker emits energy in all directions at a rate of 2.75 J/s . What is the intensity level at a distance of 25 m?

    asked by Anisha on March 10, 2011

  3. physics

    If a 80 lightbulb emits 4.0 of the input energy as visible light (average wavelength 550 ) uniformly in all directions, estimate how many photons per second of visible light will strike the pupil (4.0 diameter) of the eye of an

    asked by sarah on April 16, 2012

  4. physics

    A 14-Ξ© loudspeaker, a 9.0-Ξ© loudspeaker, and a 3.2-Ξ© loudspeaker are connected in parallel across the terminals of an amplifier. Determine the equivalent resistance of the three speakers, assuming that they all behave as

    asked by Anonymous on February 12, 2015

  5. science

    a fan uses 150j of mechanical energy, 20j of heat and 75j of sound energy a) what is the total input energy b) what is the total useful output energy c)what is the total wasted energy d) what is the energy efficiency e) what

    asked by Anonymous on December 5, 2010

  6. 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? (b) How much sound

    asked by Tyler on February 25, 2010

  7. Physics

    Which colored light bulb, red, orange, yellow, green, or blue, emits photons with the least energy? Explain. (b) Which emits photons with the greatest energy? Explain

    asked by Mary on December 13, 2007

  8. Physics

    Point A is 5 m from a loudspeaker. At point B, the loudspeaker sounds half as loud as at point A. How far is point B from the loudspeaker? I get 50 m, but the answer is supposed to be 15.8 m. I need to know what I'm doing wrong.

    asked by Reed on February 10, 2010

  9. Physics

    A special kind of light bulb emits monochromatic light of wavelength 630 nm. Electrical energy supplied to it at the rate of 60W, and the bulb is 93% efficient at converting that energy into light energy. How many photons are

    asked by Vanda on March 18, 2011

  10. physics

    An LED is a device that emits light of a particular frequency when the voltage applied across the LED reaches a certain value. This effect can be used to measure Planck’s constant. In the circuit shown below the switch is closed

    asked by Desmond on August 14, 2015

More Similar Questions