A barking dog delivers about 1 mW of power. (a) If this power is uniformly distributed in all directions, what is the sound intensity level (in decibel) at a distance of 2.5 m? (b) Without doing the calculation all over again, what is your best estimate value for the sound intensity level at 10 m away, in decibel? On what did you base this estimate? (c) What would be the intensity level in decibel, of two dogs barking at the same time if each delivered 1 mW of power at the distance of 2.5 m?

What is the decibel level of a sound that is twice as intense as a 100.0-dB sound? (b) What is the decibel level of a sound that is one-third as intense as a 100.0-dB sound?

If a sound with a singular frequency of 580 has an measured intensity of 9.79 x 10-5 w when at a distance of 5.88 m from the source, what is the decibel level when at a distance of 11.9 m from the source?

Suppose that a public-address system emits a 494 Hz sound uniformly in all directions. (a) If the air temperature is 250C (sound travels at 346 m/s), what is the wavelength of this sound? (b) If the intensity at a location 22 m away from the sound source is 3x10-4 W/m2, what is the power of the sound coming from the speaker?

Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a 90.0-dB sound intensity level for a 12.0-cmdiameter speaker that has an efficiency of 1.00%. (This value is the sound intensity level right at the speaker.)

Suppose the purr of a cat has a sound intensity that is 230 times greater than the threshold level. Find the decibel value for this cats purr. Round to the nearest decibel