Calculate the wavelengths of sounds at the extremes of audible range, 20 and 20000Hz, in 30.0o C air. (Assume that the frequency values are accurate to two significant figures.)

Sound travels at 1540 40 m/s in body tissue. If an ultrasound device sends out a frequenc of 16 MHz (16, 000, 000Hz) what is the wavelength of these sound waves?

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?

When poked by a spear, an operatic soprano lets out a 1169 Hz shriek. What is its wavelength (in m) if the speed of sound is 345 m/s?

The intensity of a sound is 400 W/m2 If the intesity level of sound decreased by 10 decibels, what is the new observed intensity?

Suppose the purr of a cat has a sound intensity that is 370 times greater than the threshold level. Find the decible value for this cat’s purr. Round to the nearest decible. ? dB

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.)