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## mayankdevnani 3 years ago An echo repeats two syllables.If the velocity of sound is 330 m/s , then the distance of the reflecting surface is- a) 66.0 m b) 33.0 m c) 99.0 m d) 16.5 m

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1. mayankdevnani

@amistre64 @TuringTest @hartnn @ganeshie8 @ghazi @theyatin

2. ghazi

i am not sure about this , but possibly its 66 m

3. mayankdevnani

yaa its right!!!

4. mayankdevnani

how do you do this? @ghazi

5. theyatin

@mayankdevnani

6. mayankdevnani

no answer is wrong it gets 16.5m @theyatin

7. mayankdevnani

@ganeshie8 @geerky42 @Aperogalics

8. theyatin

oops then i must sleep. . .

9. mayankdevnani

oh!!!! koi baat nahi

10. ghazi

this will help you http://in.answers.yahoo.com/question/index?qid=20120713012737AAWgHSc

11. theyatin

can you explain the concept of syllable??

12. mayankdevnani

i don't know what is syllable??

13. mayankdevnani

@hartnn @ash2326 @jazy @agreene

14. mayankdevnani

@TuringTest

15. theyatin

well its very tough i see it as if minimum frequency gets us time t=0.05s minimum and as we have 2 syllables 0.05*2=0.1 ( as i have studied in link given by gazi) so the distance must be velocity* time=33meter but to strike wall and come back it becomes 66 as total. . . but here question is asking for the distance of surface so i am not quite sure. . .

16. mayankdevnani

@amistre64 @AccessDenied @ash2326 @dumbcow @hartnn @UnkleRhaukus @Callisto

17. mayankdevnani

@Shane_B @surdawi @AccessDenied @ajprincess @Yahoo!

18. mayankdevnani

@henpen

19. amistre64

im assuming the question is saying that you hear your echo 2 times

20. henpen

You need the time between the 2 sounds

21. amistre64

|dw:1352738321407:dw|

22. theyatin

yey!!! that justifies my answer 16.5m which when multiplied by 4 gets an answer of 66m again explaining it. . . we can hear minimum 20hz that leads to T=0.05sec and thus the distance leads to velocity * time = 330 * 0.05=16.5 thus when multilied by 4 gets 66m. . .

23. mayankdevnani

why we multiplied it by 4 @theyatin @amistre64 @henpen

24. amistre64

the distance traveled between the "wall" and the source is quadrupled in order to hear the echo twice, as i pictured it up. assuming that im reading the question correctly to begin with

25. mayankdevnani

oh!!! i see

26. amistre64

imagine you and a friend throwing a ball back and forth; how far does the ball travel relative to your positions if you catch it 2 times and throw it 2 times?

27. mayankdevnani

i think 4 times. right

28. amistre64

correct

29. mayankdevnani

thnx... @amistre64

30. amistre64

hope its the right concept ;) good luck

31. mayankdevnani

what is syllables???

32. amistre64

im thinking that it pertains to the rebound that you hear. and not really referencing words perse

33. mayankdevnani

oh!!!

34. amistre64

if you stand in an echoy place and give a brisk woot!! you can hear how many times it echos back at you

35. amistre64

one of them old dead scientist guys used a long hallway that he knew the length of in order to estimate the speed of sound that way

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