The Doppler effect is the apparent change in frequency of a wave due to relative motion between the source and observer. It has applications including determining the velocity of moving objects, discovering Saturn's rings and the spin of the sun, and detecting binary stars and whether stars are moving toward or away from Earth. An example calculation shows an increase in observed sound frequency when a source emitting 1600Hz sound waves approaches an observer at 80m/s.

1. DOPPLER EFFECT

2. The apparent change in the frequency due to the relative motion between the source and the observer is known as Doppler effect.

8. FURTHER EXPLANATIONS

10. SHOCK WAVES

12. APPLICATIONS OF DOPPLER EFFECT

13. 1.To find out velocity of moving object. 2.Discovery of Saturn’s rings as swarm of particles and not solid discs. 3.Discovery of spin of the sun. 4.Discovery of binary stars. 5.To find out whether a star is moving towards the earth or moving away from the earth. 6.Discovery of receding of galaxies from each other.

14. NUMERICAL

15. A Source which emits sound waves of frequency 1600 Hz and an observer approach one another with a relative velocity of 80 m/s. Calculate the increase or decrease in the frequency.

16. SOLUTION

17. C=330m/s A=80m/s ν =1600Hz Observed frequency =c* ν /(c-a) =330*1600/(330-80) =2112Hz Increase in frequency=(2112-1600)Hz =512Hz

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