Wei is standing on a platform when an approaching XPT train sounds its horn. The frequency of the horn is 500Hz and the train is travelling at 126km h- 1. What is the frequency of the horn as heard by Wei? (Assume the speed of sound in air is 340ms- 1.)

Q: A French submarine and a U.S. submarine move toward each other during maneuvers in motionless water…

A: Given, speed of french submrine vF speed of us submrine vUS The French sub sends out frequency f…

Q: The horn of a train has a frequency of 375Hz. If the train is moving away from you at 38m/x, then…

A: Using Doppler effect, when the source is moving away from the person,

Q: A police car is approaching you at 26 m/s while you are at rest. The rest frequency of the siren is…

A: Given data:  Source is approaching to observer  Observer at rest  Velocity of the source (vs) = 26…

Q: The warning tag on a lawn mower states that it produces noise at a level of 95.0 dB. What is this in…

A:

Q: A ship's foghorn is blown in air whose temperature is 10 0^C. The echo from an iceberg is heard 6…

A: Given : Temperature of the air, T = 10o C Time taken for echo to reach back the ship, t' = 6s

Q: (a) What frequency is received by a person watching an oncoming ambulance moving at 130 km/h and…

A: The person (observer) is standing and watching an oncoming ambulance (a) The frequency heard by the…

Q: In this problem take the speed of sound to be 348 m/s. A. How fast, in meters per second, does an…

A: Given: speed of sound, v = 348 m/s

Q: If a plane is flying at a speed so that the apex half-angle of its shock wave is 30 degrees. What is…

A: The speed of the sound,

Q: Sound wave is passed through the loudspeaker so that the sound intensity increased by Lp=50 dB. How…

A: Given: Sound wave is passed through the loudspeaker so that the sound intensity increased by Lp=50…

Q: A train passes by a little boy at the depot. As it moves away from the boy at 65 m/s, the whistle…

A:

Q: A car is traveling 15 m/s due west rejative to the ground. An ambulance is traveling on the same…

A: Given: frequency, f0 = 1075 Hzspeed of air, c = 341 m/svelocity, vs = 35 m/s               v0 = 15…

Q: Unless otherwise indicated, for this problem, assume that the speed of sound through human tissues…

A: The observed frequency will be,

Q: Sound waves travel at roughly 340 m/s at room temperature. The minimum hearing range of a human is…

A:

Q: You are in a car moving at 90 km/h and you see someone at the side of the highway. You use your horn…

A:

Q: What frequency is received by a mouse just before being dispatched by a hawk flying at it at 25.0…

A:

Q: A fire truck emits a sound with frequency of 775Hz a. What is the frequency detected by stationary…

A: Doppler effect is the change in frequency of a wave due to relative motion of the observer and the…

Q: Dolphins emit clicks of sound for communication and echolocation. A marine biologist is monitoring a…

A: We are given speed of sound in water. We are also given apparent frequency heard by observer which…

Q: A car traveling north at 21 m>s sounds its 480-Hz horn. A bicyclist travels south on thesame road…

A: The bicyclist is moving towards the car. It is given that, vs=343 m/sfo=480 Hzvc=21 m/svb=6.7 m/s

Q: The whistle of a factory is sounding with a frequency of 700 Hz. (a) What frequency will be heard by…

A: According to Doppler         f' = f V±VoV± Vsf' = observed frcquencyf  = Actual frcquencyV = speed…

Q: The driver of a car traveling 27.0 m/s sounds his horn as he approaches an intersection. If the horn…

A:

Q: What is the frequency heard by a person driving at 76 mi/h directly towards toward a factory whistle…

A: Given: The speed with which the person (the observer) is driving directly towards the factory: vo =…

Q: an ultrasonic scan uses the echo waves coming from something moving inside the body and the waves…

A: In an ultrasound scan, we can calculate the beat frequency using the Doppler effect formula for…

Q: A police car approaches the wall with speed of v= 35 m/s while emitting sound with frequency of…

A:

Q: The intensity of a sound wave emitted by a radio is 5.00 µW/m2. What is the sound level (in dB)?

A:

Q: On a 20°C°C night, a bat hovering in the air emits an ultrasonic chirp that has a frequency of 45…

A: It is given that, the temperature of the air is T=20°C the frequency of the source is f=45…

Q: In this problem take the speed of sound to be 341 m/s.    How fast, in meters per second, does an…

A: Write the expression for apparent frequency using Doppler’s shift.

Q: (a) What frequency is received by a person watching an oncoming ambulance moving at 110 km/h and…

A: Given: frequency, f = 800 Hz  velocity of source,vs = 110 km/h = 30.6 m/s  velocity of ound, v = 345…

Q: The security alaram on a parked car goes off and produces a frequency of 1080 Hz. The speed of sound…

A:

Q: You are traveling at 19m/s while a vehicle with a siren approaches you from behind at 29m/s. You…

A:

Q: The higher frequency limit for human hearing is 22.8 kHz. If the air temperature is 33.3 °C, the…

A:

Q: A police car is driving away from you with its siren sounding. The car is going 25.0 m/s, and the…

A: The source is moving away from the observer So the perceived frequency is less than the 1000 Hz

Q: The siren of a policy car at rest emits a frequency of 1600 Hz. What frequency do you detect if you…

A: The frequency of sound emitted by the source (policy car) is given as, f  = 1600 Hz The speed of…

Q: The area of a typical eardrum is about 5.0 × 10–5m2 . Calculate the sound power (the energy per…

A: It is given that,

Q: A train blowing its whistle at 750HZ approaches a station at the rate of 35mph. What frequency is…

A:

Q: A truck travels southbound on a highway at a speed of 14 m/s. A police car, traveling northbound at…

A:

Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.