A source emits a sound of a frequency of 400Hz, but the listener hears it’s to be 390Hz. Then? a) The listener is moving towards the source b) The source is moving towards the listener c) The listener is moving away from the source d) The listener has a defective ear

Q: siren emitting sound of frequency 800Hz is going away from a static listener with a speed of 30m/s.…

A: A

Q: A point source produces sound with a power of 200 W. What is the intensity of sound at a distance of…

A:

Q: A speaker emits sound which has an intensity of 0.14 W/m? at a distance of 1.2 m. What is the…

A: It is known that, Sound intensity, I=0.14W/m2 Radial distance, h=1.2m Let acoustic power be p.

Q: The intensity of a sound wave coming from a spherical source 5 meters away is 0.1 ", m2 What is the…

A: Given data: Distance of the spherical source (r) = 5 m Intensity of the sound (I) = 0.1 W/m2 Need to…

Q: One person shouting can produce a sound level of 85 dB from a distance of 10 m. Suppose there are…

A: Given: The sound level produce when a person shouts is 85 dB from a distance of 10 m.  To determine:…

Q: A sound source that radiates equally in all directions has an intensity of 48 dB at a distance of 23…

A: (a) Let L1 denotes the intensity level at distance r1, I1 denotes the intensity, I0 denotes the…

Q: What is the minimum frequency of sound heard by human ears? O a. 20 Hz O b. 200 Hz O c. 2 Hz O d.…

A: Frequency: The term frequency describes the relationship among the sound and the wavelength of a…

Q: A fight wave and sound wave traveling through the air both have the same frequency (4000 Hz). Which…

A:

Q: An open pipe resonates with a tuning fork of frequency 500Hz. It is observed that two successive…

A: B

Q: An ultrasound machine can measure blood flow speeds. Assume the machine emits acoustic energy at a…

A: original frequency (f) = 2.2×106 Hz speed of wave in human tissue (v) = 1580 m/s speed of blood (v')…

Q: The sound level at a distance d=D44 m from a loudspeaker is 70 dB. What is the power (in Watt) at…

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Q: A whistle produces sound of frequency of 1.00 kHz. If a listener moves with a speed of 30 m/s away…

A:

Q: 20) What is the intensity of a 70-dB sound? The threshold of human hearing is 1.0 × 10-12 W/m2. A)…

A:

Q: A speaker produces 100 (w) of power, If the speaker projects sound uniformly into the forward…

A:

Q: You are traveling north on a highway moving at 23 m/sec. A police car is traveling toward you going…

A: It is given that

Q: an air column closed at one end filled with air resonates with a 150 hz tuning fork.The resonant…

A: Here,  frequency =150 Hz Length (L)= 52.5cm = 0.525 m

Q: A bat emits ultrasonic sound of frequency 1000HZ in air. If this sound meets water surface, What is…

A: The wavelength of reflected sound:-λref=vairf=340 m/s1000 Hz=0.34 m

Q: A train travelling at 30 m/s sounds its horn (frequency 780 Hz) as it approaches a tunnel in a…

A:

Q: Jo A factory uses 12 metal stamping machines. When all machines are operating, they produce a sound…

A:

Q: A The frequency detected by the boy increases as the ambulance move towards him B. The frequency…

A: Ans is option 3... Statement A alone is True.

Q: A car alarm goes off with a frequency of 2800 Hz in air with sound speed of 341 m/s. a. What…

A: Given data The frequency of the alarm is f = 2800 Hz. The speed of the sound is v = 341 m/s. The…

Q: A flute behaves like a tube open at both ends. If its length is 67.0 cm, and the speed of sound is…

A:

Q: A source of sound waves of frequency 1.00 kHz is traveling through the air at 0.800 times the speed…

A: Given frequency of emitted sound = f = 1.00 kHz speed of source = Vsource = 0.008 × Vsound We have…

Q: A person shouting at the top of his lungs emits about 1.0 W of energy as sound waves. Match the…

A: Given: The power of the sound waves emitted by the person shouting: P = 1.0 W.

Q: A sound source that has a frequency of 500 Hz moves at a speed of 15 m/s approached a silent…

A:

Q: A sound wave strikes a wall beneath the seawater surface at a distance d= 168 m away. The wave…

A:

Q: What is the sound intensity level of a sound with an W/m?? intensity of 1.7 x 10-4 dB

A:

Q: Question 10 (1 point) A police car approaches and you detect the frequency heard to be 850 Hz. The…

A:

Q: takes 2 seconds for a sound wave to travel between two fixed points when the day temperature is…

A: C

Q: A sound has an intensity of 0.0000024 Watts per square meter. What is this sound's decibel level?

A:

Q: A very loud train whistle has an acoustic power output of 100 W. If the sound energy spreads out…

A: Given that:P=100 Wd=100 m

Q: Standing at a crosswalk, you hear a frequency of 560 Hz from the siren of an approaching ambulance.…

A:

Q: Two sound waves have intensities I₁ and I2. What is difference of the sound levels in dB? I₁ =…

A:

Q: A source of sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500m/s…

A: The velocity of the wave is given by Where v = Speed of the wave, f = frequency of the wave,  =…

Q: At an air show, a jet is approaching you at a speed of 140 m/s. You hear the jet engine a frequency…

A:

Q: A speaker produces 100 (w) of power, If the speaker projects sound uniformly into the forward…

A: Given that, Power is P = 100 W Distance from the speaker is r = 3 m

Q: A longitudinal wave is represented by the equation z(z, t) = -2.0 cm sin(1.200 rad/s t-20 m-1 2).…

A: SOlution: Given that z(z, t) = -2.0 cm sin(1,200 rad/s t - 20 m -1 z) z(z, t) = +2.0 cm sin(1,200…

Q: A typical adult ear has a surface area of 2.05 x 10-3 m². The sound intensity during a normal…

A: The given data we have: Surface area of ear: 2.05×10-3m2 Sound intensity: 3.59×10-6Wm2   The…

Q: In a sinusoidal wave, the time required for a particular point to move from maximum displacement to…

A: Option d

Q: q31 A sound wave radiates from a speaker in all directions. If the power of the sound source is 400…

A:

Q: A fire whistle emits a tone of 170 Hz. What is the wavelength of the fire whistle? 0.5 m. 1.0 m. 2.0…

A:

Q: An ambulance is passing by a stationary detector emitting a 495 Hz signal . The detector measures a…

A: We use Doppler effect of sound to solve this problem

Q: 3. H.W: What is the values of the frequency received via a person looking at approaching car at…

A:

Q: A sound level 20m from a loudspeaker is 65dB, at air temperature of 35°C. The wave carries a…

A: In this case, the sound level is measured from a loudspeaker. We need to calculate the intensity of…

Q: The source of a sound wave has a power of 5.91macrowatts.if it is a point source A)what is the…

A: The objective of the question is to find the intensity of the sound wave and the sound level at a…