1 - An audio speaker producing a steady sound at an outdoor concert is 22 ft away from you. If you move to a position where the speaker is 65 ft distant, by what factor will the amplitude of the sound change?

2 -Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 3.1 m long, its mass is 0.62 kg, and the force exerted on it by the children is 43 N.

(a)What is the linear mass density of the rope (in kg/m)? kg/m

(b)What is the speed of the waves on the rope (in m/s)? m/s

3 - A 3.6 Hz continuous wave travels on a Slinky. If the wavelength is 0.63 m, what is the speed of waves on the Slinky (in m/s)? 4 - A wave traveling 79 m/s has a wavelength of 1.6 m. What is the frequency of the wave (in Hz)?

5 - A steel cable with total length 60m and mass 130 kg is connected to two poles. The tension in the cable is 1,556 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the cable.

6 - A person stands directly in front of two speakers that are emitting the same pure tone. The person then moves to one side until no sound is heard. At that point, the person is 7.40 m from one of the speakers and 7.44 m from the other. What is the frequency (in Hz) of the tone being emitted? (Assume air temperature to be 20C.)

7 - A sonic depth gauge is placed 3.1 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.016 seconds after it was emitted. The air temperature is ?20C.

(a)How far (in m) is the surface of the snow from the device? (Round your answer to at least three significant figures.) m

(b)How deep (in m) is the snow? m

8 - Approximately how many times louder is a 130-dB sound than a 70-dB sound?

9 - The force stretching the D string on a certain guitar is 145 N. The string's linear mass density is 0.007 kg/m. What is the speed of waves on the string?

10 - A 250-Hz sound travels through pure neon. The wavelength of the sound is measured to be 1.74 m. What is the speed of sound in neon?

11 - Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human tissue when examined with 16-MHz ultrasound? The speed of sound in human tissue is 1,540 m/s.

12 - A sound pulse emitted underwater reflects off a school of fish and is detected at the same place 0.17 s later (see the figure below). How far away are the fish? (Assume the water temperature is 20C.)