1.  A sound wave propagating in air has a frequency of 220 Hz. What is its wavelength? (The speed of sound in air is 343 m/s.)

Sound intensity D (decibels) is measured relative to the lowest human–detectable sound I0 = 10–12 W m–2. D = 10 log (I/I0)  What is the relative intensity from a jet with I = 9.5 × 102 W m–2 ?   D = 95   D = 150   D = 15

A pipe with one closed end vibrates with standing waves at the second harmonic. It produces a C- note that has a frequency of 264 Hz. How long is the pipe? The speed of sound in air is 340 m/s. 0.97 m 1.29 m 1.61 m 0.32 m

The figure shows two snapshots of a standing wave on a string oscillating at 1500 Hz. string length = 0.200 m string mass = 1.50 × 102 kg What is the string tension (N)? xxx 1.69 × 103 ○ 609 O 4.21 × 103 O 1.10 × 103 ○ 402 ○ 169 ○ 6.75 × 103 ○ 3.20 × 103 ○ 4.06 × 103 ○ 240

You are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a frequency of f1 = 93 Hz. As the train recedes, you hear the whistle sound at a frequency of f2 = 77 Hz. Take the speed of sound in air to be v = 340 m/s. f1 = 93 Hz f2 = 77 Hz Part (a) Find an equation for the speed of the sound source vs, in this case it is the speed of the train. Express your answer in terms of f1, f2, and v. Part (b) Find the numeric value, in meters per second, for the speed of the train. Part (c) Find an equation for the frequency of the train whistle fs ("s" is for "source") that you would hear if the train were not moving. Express your answer in terms of f1, f2, and v. Part (d) Find the numeric value, in hertz, for the frequency of the train whistle fs that you would hear if the train were not moving.

Calculate the speed of sound in air when the temperature is 16°C. m/s v = 332 m/s + |0.59 t °C

A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source, the intensity of the sound is 4.2 x 10-³ W/m². What is the total sound power P emitted by the source? P = Number 1 Units

5. A jogger runs at 9 m/s, and is trailed by a bumblebee moving at 5 m/s and emitting a frequency of 270 Hz. What frequency does the jogger hear if the speed of sound in air was 336 m/s? V=V Soos = S source (V 1 V 205) f=f Source S = ? V= 11

The instrument known as the clarinet has a length of 42 cm, and is open at one end and closed at the other. The speed of sound in air is 343 m/s. What is the lowest frequency that can be sounded on the clarinet (i.e. the fundamental, or first harmonic). Group of answer choices 408 hz 51 hz 204 hz 816 hz 102 hz

3. A bystander hears a siren vary in frequency from 598 Hz to 364 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.) m/s f60 ss f60 s ssfo ssf60 s