In longitudinal mechanical waves, rarefactions are the regions of. O a. high particle density, low air pressure O b. high particle density, high air pressure C. low particle density, high air pressure o d. low particle density, low air pressure

E6. Suppose that a guitar string has a length of 0.7 m, a mass of 0.14 kg, and a tension of 205 N. a. What is the mass per unit of length of this string? b. What is the speed of a wave on this string?

ASK YOUR TEACHE DETAILS OBINPHYS8 6.P.009. ........................ ..... ************ l Verify the values given in the textbook for the wavelengths (in air) of the lowest and highest frequencies of sound that people can hear (20 and 20,000 Hz, respectively). (Round your answers to at least three significant figures in meters and assume air temperature to be 20°C.) lowest-frequency wavelength highest-frequency wavelength Submit Answer

Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your listener, into the listener's "personal space." Model the situation by replacing you with an isotropic point source of fixed power Pand replacing your listener with a point that absorbs part of your sound waves. These points are initially separated by r = 1.10 m. If the background noise increases by Aß = 4.50 dB, the sound level at your listener must also increase. What separation rț is then required? Number i Units