Q3. At a concert you are sitting 120 m from the speakers and feel the sound level at an intensity of 115 dB. How much is the intensity for a person 60 m away from the speakers? Assume that the power spreads uniformly.

Q: 5. Mac number is? (a) Ma=1 Sonic flow (b) Ma 1

A: Mach number is define as the ration of speed of the object to the speed of the sound.

Q: A sound wave with intensity 2 x 10 -3 W/m2 is perceived to be modestly loud. Your eardrum is 6 mm in…

A: Intensity of sound (I) = 0.002 Wm2Diameter of eardrum (d) = 6 mm

Q: The Doppler effect causes a sound moving towards you to sound higher pitched and a sound moving away…

A: speed of sound (c)= 761 miles per hr using doppler's formula : f =…

Q: What is the frequency heard by a person driving at 15 m/s toward a blowing factory whistle (800 Hz)…

A:

Q: A bat can detect small objects that are roughly the same size as the wavelength of the sound they…

A: Given data: Frequency (f) = 60 kHz Speed (v) = 330 m/s Required: Wavelength (λ)

Q: A quiet library has a sound intensity level of 40 dB, and a rock band has a sound intensity level of…

A: The sound intensity of given by β=10log10II0I is the intensity of soundI0 is the threshold of human…

Q: A family ice show is held at an enclosed arena. The skaters perform to music with level 79.0 dB.…

A: Given Data Primary Sound level L1 = 79dB Secondary sound level L2 = 74dB Combined sound levels to be…

Q: Q17/ A stationary source has a frequency 1200 Hz, what frequency will be heard by driver of car…

A:

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

A: Given: The power of the source is 100 W. The distance of the point from the source is 4 m.

Q: When driven by a 120 Hz vibrator, a string has transverse waves of 31 cm wavelength traveling along…

A:

Q: A 5.2 hz continuous wave travels on a slinky. If the wavelength is 0.43m what is the speed of waves…

A:

Q: 08 A S11 Highest to lowest, rank the pitch heard when blowing across each bottle:

A:

Q: 5. Mac number is? (a) Ma=1 Sonic flow (b) Ma 1 Subsonic flow (d) Ma >> 1 Supersonic flow

A:

Q: You are sitting on a bench and a police car approaches your location at a speed of 26m/s. The police…

A:

Q: Sound waves travel in air with a speed of 343 m/s. (a) Middle Con a piano produces sound vraves with…

A:

Q: Doppler blood flow unit emits ultrasound at 4.6 MHz. What is the frequency shift of the ultrasound…

A:

Q: P7. A firecracker explodes and creates 105 dB sound at a distance of 3.0 m. (a) What sound power is…

A:

Q: A family ice show is held at an enclosed arena. The skaters perform to music with level 87.0 dB.…

A:

Q: The noise a   lawn mower produces is  80 dB. How much noise is from 2 identical lawn mowers?

A: Given: β1=80 dB

Q: A concert loudspeaker suspended high off the ground emits 35 W of sound power. A small microphone…

A: The power source,   The distance,

Q: B-A piano string vibrates with a frequency of (264 Hz). If the wave have a wavelength of (1.3m),…

A: Given, Frequency,f=264 Hz Wavelength,λ=1.3 m

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: Using a spectrum analyzer, we could determine the observed frequency when the car was driving away…

A: Using Dopplers effect formula given in solution

Q: A truck honking its 1000 Hz horn is traveling at 75 mph toward you. The speed of sound at that time…

A: From the doppler effect, the expression for the frequency heard by you is:

Q: You are sitting on a bench and a police car approaches your location at a speed of 26m/s. The police…

A:

Q: 1. A machine in a factory emits sound of intensity 71 dB. Calculate the resulting sound intensity if…

A: Given: The intensity of sound = 71 DB The second identical machine is placed beside it. Resulting…

Q: A family ice show is held at an enclosed arena. The skaters perform to music with level 75.0 dB.…

A: Given data: Skaters sound level = 75 dB Baby sound = 70 dB Need to determine the total sound…

Q: How much would the trombone player have to move the slider in cm to play 25 Hz ? Be sure you know…

A: Given, Frequency of the trombone, f = 25 Hz

Q: A firetruck sounds its horn (600 Hz) as it approaches a pedestrian by the side of the road. The…

A: The pedestrian hears a frequency which is slightly higher than the original frequency emitted by the…

Q: A 60.00-cm guitar string under a tension of 50.000 N has a mass per unit length of 0.100 00 g/cm.…

A:

Q: 5. A guitar string with a linear density of 2.4g/m is stretched between supports that are 60cm…

A: The number of antinodes, n = 3 The linear density of the string, μ = 2.4 g/m = 2.4×10-3 kg/m The…

Q: What is the intensity of a sound that has an intensity level of 95 dB? W/m? 60 ss

A: Given data:  Intensity level (β) = 95 dB Required: Intensity of sound in W/m2

Q: The highest frequency sound humans can hear is about 20,000 HzHz. 1. What is the wavelength of sound…

A: highest frequency of sound human can hear = fhigh=20,000Hz  lowest sound frequency human can hear…

Q: Blue whales communicate with each other using a sound frequency of 18 Hz, which can be heard nearly…

A: Given that Frequency f = 18 Hz Distance d = 1000 km Speed of sound wave V = 1530 m/s

Q: The softest sound a human ear can hear is at 0 dB (Io = 10-12 W/m2). Sounds above 130 dB cause pain.…

A:

Q: A family ice show is held at an enclosed arena. The skaters perform to music with level 80.0 dB.…

A:

Q: What are the three longest wavelengths for standing sound waves in a 127-cm-long tube that is (a)…

A:

Q: P6. Calculate the factor by which the intensity of a sound wave increases if the sound level…

A: We need to calculate the factor by which we should increase the intensity of sound in order to…

Q: The air temperature is 92 degrees Fahrenheit. A truck is honking its horn as it is traveling at 30…

A: Given, Velocity of the source vs=30 mph=303600=8.33×10-3 m/s velocity of sound =341 m/s Frequency of…

Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.