A train approaches a platform at a speed of 22 km/h while it blows its whistle. Someone on the platform hears the whistle at 342 Hz. Calculate the actual frequency of the whistle. (speed of sound = 343 m/s)

A string of length 0.25 m has a mass per unit length of 0.040 kg/m. The frequency third harmonic of the string is 330 Hz. What is the tension in the string?

Problem 9:  One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 34 m/s has a siren which produces a frequency of fs = 438 Hz.Randomized Variables vS = 34 m/sf = 438 Hz       Part (a) What frequency (in Hertz) does the driver of the truck hear?Numeric   : A numeric value is expected and not an expression.fd = __________________________________________Part (b) What frequency (in Hertz) does an observer hear when the truck is moving away?Numeric   : A numeric value is expected and not an expression.fo = __________________________________________   Problem 10:  A student knows that an ambulance siren has a frequency of fs = 395 Hz. He measures, when the ambulance is approaching him, the frequency fo = 416 Hz. Assume the speed of sound is 343 m/s in this problem.       Part (a) Input an expression for the ambulance's speed, vs, in terms of the frequencies and the speed of sound v.Expression   :vs =…

A bungee jumper jumps from rest and screams with a frequency of 403 Hz. The air temperature is 20 °C. What is the frequency heard by the people on the ground below when she has fallen a distance of 14.3 m? Assume that the bungee cord has not yet taken effect, so she is in free-fall. Number Units

A train is moving at a speed of 50 m/s with its whistle on, the frequency of the whistling sound being 400 Hz. What should be the approximate frequency heard by a stationary observer as the train approaches the observer. Take the speed of sound as 345 m/s when atmospheric temperature is 24°C. 468 Hz 486 Hz 490 Hz 400 Hz

Male Rana catesbeiana bullfrogs are known for their loud mating call.The call is emitted not by the frog’s mouth but by its eardrums, which lie on the surface of the head. And, surprisingly, the sound has nothing to do with the frog’s inflated throat. If the emitted sound has a frequency of 260 Hz and a sound level of 85 dB (near the eardrum), what is the amplitude of the eardrum’s oscillation? The air density is 1.21 kg/m3.

A bystander hears a siren vary in frequency from 590 Hz to 368 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.)

As you stand by a railroad track, a train approaches with its whistle blowing.  After the train has passed you, you hear that the whistle frequency is 18.0% lower than its frequency while the train was approaching. How fast is the train moving? Express your answer in km/hr. (Note that the speed of sound that day is 332.7 m/s.)

A fire engine siren emits sound at 1260 Hz. The fire engine is driving down the street toward you at 29 m/s. (The speed of sound in air is 343 m/s.) What frequency sound do you hear? What frequency sound do you hear after the fire engine passes you?

An ambulance with a siren emitting a frequency of 1600HZ overtakes and passes a cyclist pedaling a bike at 4 m/s. After being passed, the cyclist hears a frequency of 1590HZ. How fast is the ambulance moving? Temperature of air is 25°C. 2.