what is doppler effect?

Dear Manjunath

                            The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It is named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague.

Hello Manju

              Doppler effect:An apparent change in the frequency of waves, as of sound or light, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart.

dear manju,......

    The Doppler effect is observed whenever the source of waves is moving with respect to an observer. The Doppler effect can be described as the effect produced ...

Doppler effect is an   apparent change in the frequency of waves, as of sound or light, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart.this is called doppler effect.

doppler effect...an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.

Hello manjunath,

                           Doppler effect means an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.

hallo manjunath

doppler effect is defined as the apparent freequency heard by the listener due to the ralative motion between source and listener.

hai manju,an increase or decrease in the frequncy of sound light,or other waves as the source and observer move towards each other.the effect causes sudden change in pitch noticeable in a passing siren.