Sound Waves Questions and Answers

6 15 pts a Two loudspeakers located along the x axis as shown in the figure produce sounds of equal frequency Speaker 1 is at the erorigin while the location of speaker 2 can be varied by a remote control wielded by the listener He notices maxima in the sound intensity when speaker 2 is located at x 0 75 m and 1 00 m but at no points in between What is the frequency of the sound Assume the speed of sound is 340 m s b Mention an application of destructive interference of sound waves 1 2 8

4 A tuning fork with frequency 800 Hz produces resonance in a resonance column tube with upper end open and lower end closed by water surface Successive resonance are observed at length 9 75 cm 31 25 cm and 52 75 cm The speed of sound in air is v 4x9 75x8 1 500 m s 2 156 m s 32x9 75 3 344 m s 4 172 m s V

Four runing forks of frequencies 200 201 204 and 206 Hz are sounded together The beat frequency will be 1 6 3 15 2 12 nozog 4 None of these

A bat moving at 10 ms 1 towards a wall sends a sound signal of 8000 Hz towards it On reflection it hears a sound of frequency f The value of fin Hz is close to speed of sound 320 ms 1 8258 2 8516 3 8000 4 8424

3 In a closed organ pipe the first resonance occurs at 25 cm at what length of pipe the second resonance will occur 1 75 cm 3 75 cm 2 75 cm 4 75 cm wave having pode at x 0

The frequency of a radar is 780 MHz The frequency of the reflected wave from ar aeroplane is increased by 2 6 KHz The velocity of air plane is 1 0 25 km s 3 1 0 km s E 2 0 5 km s 4 2 0 km s E

While traveling down the road at 55 mph you pass a fire station where the siren is blowing Which of the following observations is attributable to the Doppler Effect Select one O a The pitch of the siren changes as you approach the fire station O b The loudness of the siren increases as you get closer to the fire station O c The fire station gets larger as you approach it O d The siren s pitch and volume remain constant

Question 7 10 Points A 7 4 m long string has a mass of 2 29g What is the mass in kg of an object hung from its end if a 179 Hz wave has a wavelength of 74 cm Round your answer to 3 decimal places Add your answer

piano string is 1 4 m long and has a mass of 6 3 grams How much tension must be applied on the string if it is to vibrate at a undamental frequency of 129 Hz

6 An object weighing 16 pounds stretches a spring 2 feet The subsequent motion takes place in a medium that offers a damping force numerically equal to 4 times the instan taneous velocity If the mass is initially released from the equilibrium position with an upward velocity of 2 ft s Find the equation of motion Hint Use g 32 ft s for the acceleration due to gravity to determine the mass m and x 0 0 and x 0 2ft s

For a certain transverse wave the distance between two successive crests is 1 41 m and 8 crests pass a given point along the direction of travel every 11 4 s What is the wave speed in m s Round your answer to 2 decimal places

The sitar an Indian musical instrument has a set of strings that vibrate and produce music even though they are never touched by the player These sympathetic strings are identical to the plucked strings that are mounted right above them What is the vocabulary word that describes this phenomenon

A string of length 1 m has a fundamental node frequency of 5 Hz If this string is plucked transversely and is the touched a point in the centre what frequencies persist

16 Identify the following key characteristics of sound intensity how sound intensity is measured intensity level of sound intensity that damages human hearing above to dB level of the faintest sound humans can hear 20 dB Organize information about sound frequencies in the table Name Infrasonic Sonic Ultrasonic Frequencies Complete the graphic organizer about the Doppler effect alle 19 ggo When a source of sound is moving you compressions are sound has a frequency and a pitch Humans Use or Examples can hear OO OO so the sla 160 mspelled 000 When a source of sound is moving you compressions are sound has a frequency and a pitch GET IT Describe the Doppler effect so the

What is the wavelength of a radar signal that has a frequency of 36 GHz The speed of light is 3 x 10 m s Answer in units of m Answer in units of m Your response 1 12 13 14 15 16 7 8 9 10 11

TOO C A trombone player stands at the end zone x 0 of a football field and begins to play its fundamental tone Assume the trombone is a half open tube that is 3 m long How long does it take in s for the sound to travel to the other end zone z 300 ft

A musical instrument produces a frequency of 1183 7 when it vibrates in the fifth harmonic The fundamental frequency of this instrument is

Using the wave graphs provided answer the following a Which wave pattern corresponds with a low pitch quiet sound b Which wave pattern would be produced by a loud high pitched sound A

Anna was on vacation and came across an echo lake Wanting to know how far she had to swim to get across the lake to the other side she yelled across Hello How wide is the lake if 10 seconds later she heard her own echo Assume that the temperature is 20 C and the speed of sound is 344 m s Answer in units of m

Given a beat frequency 8 Hz and a tuning fork of 256 Hz what is the frequency of a second tuning fork that has a lower pitch

A bat flying in a cave emits a sound reflecting off a wall 850 m away How much time until she hears the echo Assume the spe of sound in the cave is 340 m s

1 Explain the difference between the way sound waves behave and the way light waves behave 2 A small child pokes a paintbrush into her ear and tears her eardrum Explain how this might affect her hearing using evidence from the text to support your response The diagram below shows three different waves A B and C Use the diagram to answer questions 3 4 W 3 Which of the waves above would you expect to be the loudest Use specific evidence from the diagrams and article to support your response AMAN wwww 4 Which of the waves would you expect to be produced by someone singing a low note Use specific evidence from the diagrams and article to support your response

If a guitar string has a fundamental frequency of 250 Hz what is the frequency of its third harmonic Select one O a 250 Hz O b Any of the above could be true O c 2000 Hz O d 750 Hz Oe 1000 Hz

A sound wave traveling at 342 m s is emit ted by the foghorn of a tugboat An echo is heard 2 40 s later How far away is the reflecting object Answer in units of m Your response

Assume that the speed of a sound wave produced by an elephant at 20 C is 344 m s and its frequency is 1 3579 x 105 Hz What is the wavelength of this wave Answer in units of m

The fire alarm goes off and you hear a very high pitched extremely loud sound How would you describe the characteristics of the fire alarm s sound wave a A high frequency low amplitude wave b A high frequency high amplitude wave c A low frequency high amplitude wave d A low frequency low amplitude wave

During a single period the distance traveled by a wave is Select one O a one wavelength O b two wavelengths O c one half wavelength

The main factor that affects the speed of a sound wave is the Select one O a amplitude of the sound wave O b pitch of the sound properties of the medium O c O d loudness of the sound e intensity of the sound

If a person yells as opposed to whispering then it will cause Select one O a the pitch of the sound to be higher O b the speed of the sound to be faster O c the loudness of the sound to be louder

1 The string of a piano that produces the note middle C vibrates with a frequency of 264 Hz If the sound waves produced by this string have a wavelength in air of 1 30 m what is the speed of sound in air 2 A piano emits frequencies that range from a low of about 28 Hz to a high of about 4200 Hz Find the range of wavelengths in air attained by this instrument i e the highest and the lowest

Use Mersenne s law to answer the following question A certain stretched string has a fundamental frequency of 246 Hz What is the new frequency if the linear mass density decreased by a factor of 9 Answer in units of Hz and round to the nearest integer

A siren in the middle of town warns of an approaching tornado while in the car different from what a person would hear standing right next to the siren The student hears a louder sound The student hears same pitched sound The student hears a higher pitched sound The student hears a lower pitched sound ELLY

What is the speed of sound in a stretched string of length 1 4 m and second harmonic vibrating at 414 Hz It is known that v Af Answer in units of m s and round to one decimal place

A child sitting at the end of a dock notices that 8 wavelengths pass by in 4 seconds What is the frequency of the waves passing the dock 0000 4 Hz 5 Hz 0 Hz 2 Hz

Which sound will most likely have the highest pitch O a bass drum 150 Hz O a distant thunder 90 Hz O a tuba 60 Hz O a whistle 1000 Hz An opera singer breaks a crystal glass with her voice Which best explai why this occurs O The pitch of her voice matches the pitch of the glass O The amplitude of her voice heats the glass until it breaks O The intensity of her voice produces a standing wave in the glass The frequency of her voice matches the natural frequency of the glass

Look at the diagram Which point identifies a node O A OB O C O D A C B D

Look at the two wave diagrams Which best describes the differenc between wave A and wave B Wave A Wave B Time wwwwwwww www Time Air Pressure Air Pressure O Wave A has a greater pitch and frequency Wave B has a greater pitch and frequency Wave A has a greater pitch but lower frequency O Wave B has a lower pitch but greater frequency

What is the Standard International unit for intensity O decibel O O Joule meter Watt

Which best describes pitch O the amount of time taken for a longitudinal wave to produce one cycl O the number of cycles per second perceived by the human ear O the amplitude of a wave when the natural frequency is matched O the distance between two corresponding parts of a transverse wave

Which best describes loudness O the subjective measurement of the intensity of sound O the subjective measurement of the wavelength of a sound wav O an inherent measurement of the intensity of sound an inherent measurement of the wavelength of a sound wave

A sound wave travels through air In which regions are air molecules the least dense O compressions Ofrequencies O pitches O rarefactions What best describes a sound wave O transverse and electromagnetic Olongitudinal and mechanical O longitudinal and electromagnetic

What is the name of the perceived change in a sound wave s frequency due to motion between the observer and the sound source O diffraction O Doppler effect O reflection O resonance An ambulance emits a frequency of 450 Hz from its siren What frequency is heard by a man as the ambulance moves toward him O less than 450 Hz O more than 450 Hz O 450 Hz 0 Hz

The diagrams show the sound waves produced in one second from various tuning forks Which sound wave has the lowest pitch O A OB

For sound waves different frequencies mean different a loudness b pitches c amplitudes d speeds e none of the above

Once a tuning fork is struck and begins to vibrate a different tuning fork 5 feet away starts to vibrate with the same natural frequency This behavior is called O Frequency O Resonance O Alignment Disturbance

1 The image above represents a standing wave a What harmonic does this represent b What is the wavelength wave if the distance for the image is 3 00m c If the period of the wave is 2 00s what is the frequency of the wave S d What is the speed of the wave on the string 2 A power source of 2 00 W produces a sound wave a What is the intensity of the sound wave at a distance of 5 00 m from the source the surface area of a sphere is 4 r

According to when you see the condensed steam released a factory whistle blows 1 70 s before you hear the sound If the air temperature is 22 4 C how many meters are you from the whistle

Sound intensity is directly proportional to L

26 Calculate the intensity of the sound waves from an electric guitar s amplifier at a distance of 3 2m when its power output is equal to 0 79W

What is the unit for sound intensity Sound intensity is directly proportional to