The sound intensity at a distance of 8.5 m from a siren is 9.5 x 10^-2 W / m^2 . Determine the total radiated power. Assume that the sound propagates uniformly in all directions.

A round speaker emits sound waves uniformly in all direction. At a distance of 40.0m from the speaker, the sound intensity is 35 dB. What is the sound intensity level in a distance of 10.0m.

Ultrasonic deep heating is accomplished by applying ultrasound of intensity 5.25 x 10³ W/m2 with a circular transducer having a radius of 3.10 cm. How long must this be applied for 1.00 kcal to be emitted? 264.11 X min

1. (a) What is the intensity in W/m² of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 650 J of energy into a circular spot 1.9 mm in diameter in 4 s? Hint: The laser is a collimated beam of light and does not produce a spherical wave. W/m² (b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m²) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure. The intensity of a laser is about be very damaging if they enter your eye. ✓times that of the sun, so clearly lasers can

An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove Questi

Deep ultrasonic heating is used to promote healing of torn tendons. It is produced by applying ultrasonic sound over the affected area of the body. The sound transducer (generator) is circular with a radius of 1.46 cm, and it produces a sound intensity of 6.53 × 103 W/m2. How much time is required for the transducer to emit 3910 J of sound energy?

What is the wavelength of a 256-hertz sound wave in air at 31 degrees Celsius? a b с Od 0.773 m 8.53 * 10^-7 m 1.17*10^6 m 1.37 m

A speaker designed to emit spherical sound waves is producing a sound intensity of 8 W/m2 at a distance of 1 m from the speaker. What would be the intensity of this sound at a distance of 2 m from the speaker?

You hear a song from your playlist you haven't heard in a while and it warrants you to commence singing.  As you are sing, the power of the compression wave you create is approximately 297.02 nW (note, nW is nano-Watts).  What is the intensity of this sound as measured by your roommate who is standing 6.04m from you?  Please give your answer in units of nW/m2.  This unit is not a common one.  Usually, the unit would simply be Watts per square-meter (which would be your answer divided by a million!).  This goes to show you that are ears are amazingly sensitive to very tiny sound intensities.  Note: Intensity was a topic covered in section 11.1, and I will provide the formula: I = P / A where P is the power in units of Watts, and A is the surface area of a sphere of radius "L" (in this problem).

A person wears a hearing aid that uniformly increases the sound intensity level to all audible frequencies by 35 dB. The hearing aid picks up the initial frequency of 4.5 kHz at an intensity of 4.55X10^-11 W/m^2. What is the intensity delivered to the ear drum?