A sound wave in air at 20? C has a frequency of 150 hz and a displacement amplitude of 5m. For this calculate pressure amplitude,intensity of sound and sound intensity level.

q/ A single-atom crystalline chain with an Space between 3x10 ^ -10m. If the velocity of sound is equal to 300 m / sec, calculate the cutoff frequency wm

A rock band creates a sound intensity level of 111 dB at a distance of 20.0 m. (a) Calculate the sound intensity. W/m2 (b) Assuming sound from the amplifiers travels as a spherical wave, what average power do the amplifiers generate?

cicadas produce a buzzing aound that has a wavelength in te air of 2.69 m . If the spped of the sound in air is 346m/s , what is the frequency of teh sound produced by a cicada? what is its period?

Problem #3: What intensity level dB in does a sound of 3. 04 × 10–4 W/m2 correspond to?

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

1) The root mean square pressure value of several sound sources is 33, 43, 53, and 63 Pascal. What is the equivalent sound pressure of each one alone in decibel?

WORK, ENERGY POWER P CA 0.2793 kg rocket in a fireworks display is launched from rest and follows an erratic flight path to reach the point P. Point P is 29 m above the starting point. In the process, 400 J of work is done on the rocket by the nonconservative force generated by the burning propellant. Ignoring air resistance and the mass lost due 29 m he Vo = 0 m/s to the burning propellant, find the speed vf of the rocket at the point P. ho