What is the intensity in watts per meter squared of 85.8 dB sound? The reference threshold intensity is 10-12 = W m² I= W m²

Based on the graph in Figure 17.36, what is the threshold of hearing in decibels for frequencies of 60, 400, 1000, 4000, and 15,000 Hz? Note that many AC electrical appliances produce 60 Hz, music is commonly 400 Hz, a reference frequency is 1000 Hz, your maximum sensitivity is near 4000 Hz, and many older TVs produce a 15,750 Hz whine. Figure 17.36 The relationship of loudness in phons to intensity level (in decibels) and intensity (in watts per meter squared) for persons with normal hearing. The curved lines are equal-loudness curves—all sounds on a given curve are perceived as equally loud. Phons and decibels are defined to be the same at 1000 Hz.

What frequency is received by a mouse just before being dispatched by a hawk flying at it at 25.0 m/s and emitting a screech of frequency 3500 Hz? Take the speed of sound to be 331 m/s.

a noise level meter reads the sound level in a room to be 85 dB. What is the intensity of sound in W/m^2?

What is the speed of sound in substance X if a note produced at 440Hz has a wavelength of 14.8 m?

You've heard a loud noise that registers at 170 dB!  What is the intensity in W/m2?

Two sound waves have intensities of 1 times 10 to the -5 W/m2 and 5 times 10 to the -4 W/m2. What is the difference in their intensities levels (db)? I0 = 10 to the -12 W/m2.

Problem 3:  The human ear can detect a minimum intensity of Io = 10-12 W/m2, which has a sound intensity of 0 dB.Randomized Variables β = 45 dB       If the student hears a sound at 45 dB, what is the intensity of the sound?Numeric   : A numeric value is expected and not an expression.I = __________________________________________   Problem 4:  A student exchanges the stock headphones (β1 = 87 dB) for her mp3 player for a new set that is louder (β2 = 95 dB).       If the first set produced a power of P1 = 0.5 W how much power does the new set produce, P2 in W?Numeric   : A numeric value is expected and not an expression.P2 = __________________________________________

A loud vacuum cleaner outputs 1.5 mW of sound energy. What is the intensity of the sound wave 2.0 meters away? (Give your answer in ?μW/m2.)

1:26 ull : O qiven that the density of air 1.20 kg/m"3 and the speed of sound 343 m/s* A vacuum cleaner produces sound with a measured sound level of 70.0 dB. (a) What is the intensity of this sound in W/m²? (b) What is the pressure amplitude of the sound?