## boomerang285 2 years ago f=c/wavelength. Please help, not sure how to calculate f. c= 3.00 x 10^8 m/s wavelength = 268nm

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1. kausarsalley

plug in the values you have in the formula..

2. boomerang285

but i get a giant number, and not sure what I do after that.. i need to figure out f=____hz

3. boomerang285

f=3.00x(10^8)/268nm

4. boomerang285

I feel like I am missing a step or something.

5. kausarsalley

you did not concert the wavelength which is on nanometers into meters..

6. kausarsalley

can you do that or should i help with that??

7. boomerang285

2.68 x 10^7 ?

8. boomerang285

10^-7?

9. kausarsalley

no..... nano = 1* 10^-9

10. kausarsalley

does that help??

11. boomerang285

im a little confused.

12. kausarsalley

@boomerang285 are you there?

13. kausarsalley

where??

14. boomerang285

I really don't understand this.

15. boomerang285

I don't get how to plug in the numbers, when I have to change them as well. 268 nm changes to meters right? is it not 268nm= 2.68 x 10^-7m?

16. kausarsalley

to convert the wavelength from nanometers to meters you need to multiply by 10^-9

17. kausarsalley

nano in its number state is 10^-9.....so nm=10^-9m

18. boomerang285

ok

19. kausarsalley

no since nano is 10^-9, it is supposed to be 2.68 x 10^-9m

20. boomerang285

oh ok.... makes sense, so then the equation (f=c/wavelength) has those values in it?

21. kausarsalley

yes....so what do you get after you plug in the numbers??

22. boomerang285

this is the tricky part for me.. I dont know how to correctly work it out

23. boomerang285

it looks like this though right? 3.00 x 10^8 / 2.68 x 10^-9

24. kausarsalley

yes...

25. boomerang285

ok

26. boomerang285

80.4? probably way off...

27. kausarsalley

input what you have on your calculator...

28. kausarsalley

that is not what i got..

29. boomerang285

0.1119402985

30. kausarsalley
31. kausarsalley

does that help??

32. boomerang285

yes, i just didnt have the negative for the 10^-8

33. kausarsalley

oh okay...you have to be careful next time.

34. kausarsalley

do you get it now??

35. boomerang285

yes, so obviously I don't put in all the numbers.. so f = 11.15?

36. kausarsalley

yes...

37. boomerang285

thank you!

38. kausarsalley

yw!