YumYum247 one year ago 5

1. anonymous

so in 0.10 seconds the wave generator goes through 3 cycles; the frequency is $$f=\frac{N}{\Delta t}=30\text{ Hz}$$

2. anonymous

in one single second, there will be ten times as many waves produced (30)

3. YumYum247

This is how i did it... Given: # of loops = 3, d = 4.5m, t = 0.10sec. required: F = ? Solution : 3 loops = 3/4 λ = 3/4 λ X 3 = 4.5 λ V = d/t V = 4.5 / 0.10sec V = 45m/sec Frequency = V = f X λ V = 45m/sec / 4.5 λ V = 10 Hz Therefore the frequency is 10 Hz

4. YumYum247

the question said "LOOPS" not cycles

5. YumYum247

1 complete cycle = 4 loops

6. anonymous

eh, the language is ambiguous; a complete loop would be half a cycle, anyways, so in actuality that would represent one-and-a-half cycles in 0.1 seconds and so a corresponding 15 cycles in 1 second, or $$f=15\text{ Hz}$$

7. anonymous

can you define carefully what you mean by 'loop'? |dw:1436322714361:dw|

8. YumYum247

and what happened to the distance....4.5m?????????

9. anonymous

the distance is not needed to determine the frequency here since you told us that it generates three loops in a certain time span directly

10. YumYum247

i don't buy it, but thanks for the help tho.......:")

11. perl

you want to use that equation directly speed = wavelength * frequency

12. YumYum247

but i have to figure out the wavelength first right..............i've already done the question above. please check y work.

13. YumYum247

Can someone please check my work?????????????????????????????????????????????????????

14. anonymous

I'm thinking that a loop is a full period. Though I'm just going from unit circle imagery :) |dw:1436323530849:dw|

15. perl

I agree, a complete loop sounds like 1 up and down motion.

16. YumYum247

OMg.....1 loop is 1/4 of a full cycle...here|dw:1436334439572:dw|

17. perl

v = lambda * f v= 45 m/sec lambda= (4.5 / 3) = 1.5 m 45 = (1.5) * f 45/1.5= 30 Hz

18. perl

Does your book define a loop?

19. YumYum247
20. YumYum247

start at 9:21

21. perl

the youtube is defining 1 loop = 1/2 wavelength

22. YumYum247

oh that's right, sorry i made a mistake, i just looked at my notes LOL

23. YumYum247

OMG O_O!

24. YumYum247

i guess i'll jst re do the whole qeston...

25. anonymous

huh, I've never seen "loop" notation before.. best of luck

26. perl

but the term 'complete loop' seems to be suggestive

27. YumYum247

no but i plugged in the right value there....since there are three loops = 3/4Lambda

28. YumYum247

or 2/2 + 1/2lambda

29. anonymous

for anyone else curious about "loops", refer to http://www.physicsclassroom.com/class/waves/Lesson-4/Mathematics-of-Standing-Waves Its only really used when describing standing waves such as this, as the string itself alternates between the upper and lower position between two antinodes

30. YumYum247

indeed

31. YumYum247

@dan815 hey please check my work at the top!!!

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