The Doppler Effect......?

Question

The Doppler Shift involves a shift in the __. List all that apply
A. the loudness of a sound observed by a listener
B. the perceived pitch of a sound observed by a listener
C. actual frequency produced by the source of sound
D. actual intensity produced by the source of sound
E. none of these

Answer 1

E. The Doppler effect changes frequency. But not from the source, by the observer.

Think of it as a police siren that approches you, then passes you. The frequency increases until they pass you, then decreases.

Answer 2

The Doppler effect isn't limited to sound waves even if that's axiomatic to the very concept of what a "wave" is in nature. The Doppler effect is extra suited categorised the "Doppler Shift". the simplest occasion of which interior the genuine of sound waves is the alteration in pitch of a whistle on a locomotive. in case you have been status on the factor of a railroad tracks with a prepare coming near you at ninety MPH, the sound of a whistle on the prepare on your concept might strengthen in pitch relative to the fee of its physique of ideas. After it handed your area, going any opposite direction, the pitch might decrease because of the fact the prepare went off interior the area. the comparable factor happens with easy waves. the easy waves emanating off an merchandise because it approached you will possibly "shift" to bigger frequencies merely like the sound waves did; even if, "bigger frequencies" for this reason are what we replace into attentive to because of the fact the colors blue and violet. because of the fact the object handed you and went off into the area, the easy waves might "shift" in direction of decrease frequencies as represented with the help of the colour crimson. To simplify issues extra, merely image unbiased colour products coming near you at extreme velocity performing "blueish", on a similar time as issues shifting remote from you as "reddish". Why this effect happens is a procedures previous the scope of a few paragraphs. even if, think of sound waves or easy waves as springs shifting in front of an merchandise. because of the fact the object procedures you the "springs" are compressed, because of the fact the object strikes remote from you the "springs" are stretched. This compression or stretching of the waveform motives the shift in frequency. The extra effective the fee, the extra effective the shift. An merchandise coming near you at or at with reference to the fee of sunshine or going remote from the comparable velocity might in concept be invisible because of the fact the shift may be so great as to pass the frequencies thoroughly off of the spectrum of what's seen to the human eye.

Answer 3

Im guessing a, b, how does an airplane sound when approaching & leaving????

Answer 4

b only

Answer 5

b

Answer 6

B

Answer 7

b,c