A train blows its whistle as it moves rapidly towards a stationary observer. Which of the following best describes the sound of the whistle as heard by the observer in comparison to the sound as heard by a passenger on the train?A The sound heard by the observer will be the same as the sound heard by the passenger.B The sound heard by the observer will of a higher volume than the sound heard by the passenger.C The sound heard by the observer will be higher in pitch than the sound heard by the passenger.D The sound heard by the observer will be lower in pitch than the sound heard by the passenger.

A train is traveling west at a velocity of 25 m/s.  Another train is traveling east directly toward the west-bound train at a velocity of 15 m/s.  The west-bound train blows its whistle with a frequency of 600 Hz when the two trains are 1000 m apart and then blows its whistle again 10 seconds later.  For passengers on the east-bound train, how will the perceived frequency of the first whistle compare with the perceived frequency of the second whistle?  (Note: Use 350 m/s for the speed of sound in air.)A.It will be 60% higher than the frequency of the second whistle.B.It will be 40% higher than the frequency of the second whistle.C.It will be approximately identical to the frequency of the second whistle.D.It will be 40% lower than the frequency of the second whistle.

Describe the sound energy transformation in each situation.WHISTLING

As a train starts from rest and then accelerates down the track, coming toward me faster and faster, the speed of the sound waves coming toward me will be:Select one:a.some constant speed faster than the normal speed of sound in air.b.equal to the normal speed of sound in air.c.faster and faster.d.slower than the normal speed of sound in air.

When a source of sound and an observe are in relative motion, the pitch of sound heard by the observer is different from the original pitch delivered by the source. This phenomenon is called Doppler effect.If source of sound is stationery and observer is moving towards the source with a velocity  v0 then the apparent frequency heard by the observer is given by  v′  =  (c + v0c)v, where  v is the original frequency of source. Similarly, if observer is at rest and source is moving towards the observer with a velocity  vs the apparent frequency heard by the observer is given by  v′  =  (cc − vs)vIf the direction of motion of observer or source is changed, the sign of velocity changes (i.e., ‘+ve’ sign changes into ‘-ve’ sign and vice-versa). (Where C = speed of sound in air = 340 m/s)An observer moves towards a stationary source of sound producing a pitch of 600 Hz with a velocity 60 ms-1. What is the apparent frequency heard by the observer if velocity of sound is 340 ms–1?

A braking train emits a very loud, high-pitched sound.Explain whether the amplitude, frequency and wavelength of the sound waves are relatively high or low.