## anonymous one year ago A ray in the emission spectrum has a wavelength of 3.10 x 1014 meters. Given that the speed of light is 2.998 x 108 m/s, what is the frequency of the ray?

1. anonymous

i know the equation to work it out but how would i set it up?

2. rvc

okay what is the equation?

3. rvc

$v=n\lambda$

4. rvc

v= 2.998 X 10^8 which can be approximated as 3 X 10^8 lambda = 3.10 X 10^14

5. anonymous

is that the one ?i thought it was velocity of a wave = frequency x wavelength

6. anonymous

You have to use the given formula: $f=\frac{ v }{ \lambda }$, where f is frequency, v is speed and lambda is wavelength.

7. rvc

|dw:1435079711852:dw|

8. anonymous

oh okay i see now

9. rvc

you are correct @flight23

10. rvc

now just re-arrange

11. anonymous

okay well i did that and i got an answer way off :(

12. anonymous

@rvc

13. anonymous

What did you get?

14. anonymous

1.0340e16 @Hoslos

15. anonymous

@Hoslos but hey can you help me on this one question its easy but i just wanna double check lol?

16. anonymous

No problem. Maybe you did not consider that those figures have exponents. Simply plotting the following in your calculator, you get$f=\frac{ 2.998*10^{8} }{ 3.10*10^{14} }=9.67*10^{-7}Hz$

17. anonymous

ohh i probably put something in wrong but thank u so much appreciate it ! @Hoslos

18. anonymous

Right.