A particular photon has a wavelength of approximately 2 x 10-7m. What is the energy, in joules, associated with this photon?

A. 1.5 x 1015
B. More information is needed.
C. 1 x 1018
D. 1 x 10-18
E. 4 x 10-32

Question

A particular photon has a wavelength of approximately 2 x 10-7m. What is the energy, in joules, associated with this photon?

 		A.	1.5 x 1015
 		B.	More information is needed.
 		C.	1 x 1018
 		D.	1 x 10-18
 		E.	4 x 10-32

vera_ewing · Answer

@sweetburger

vera_ewing · Answer

Those are exponents btw

sweetburger · Answer

I cant remember i think E = planks constant (speed of light) all divided by the wavelength but im not sure

sweetburger · Answer

i got to look it up

vera_ewing · Answer

A.	1.5 x 10^15
B.	More information is needed.
C.	1 x 10^18
D.	1 x 10^-18
E.	4 x 10^-32

sweetburger · Answer

is the frequency 2x10^-7?

sweetburger · Answer

i mean wavelength?

sweetburger · Answer

not frequency

vera_ewing · Answer

Yes it is

sweetburger · Answer

welp im trying the speed of light/ the wavelenght of light to find  the frequency which i get to be 15seconds and then i multiply it by planks constant 6.6x10^-34 to find the energy but im not getting anything close to the correct answer only like 9.9x10^33

vera_ewing · Answer

So how sure are you? Like 100% sure about the answer?

sweetburger · Answer

well i know my math is sound i used my calculator and i used the E=HV which would be the equation to find the energy of a photon and i used C=wavelength(V) to find the missing frequency. So maybe in this question they are expecting to say not enough information given, but i really dont know.

vera_ewing · Answer

What would you say? What's the BEST answer choice?

sweetburger · Answer

im going to check to make sure my units are correct maybe i didnt solve for Joules

vera_ewing · Answer

Ok yeah it says solve for Joules maybe that's why...

sweetburger · Answer

well i solved it definitely for joules so idk

vera_ewing · Answer

A particular photon has a wavelength of approximately 2 x 10^-7m. What is the energy, in joules, associated with this photon? 

You looked carefully at that ^^ right?

sweetburger · Answer

ya, your given wavelenght so you can either use planks constant times the speed of light divided by the wavelenght to find the energy of the photon or you can divide the speed of light by the wavelength to get the frequency and then multiply times planks constant which give you the same answer either way

vera_ewing · Answer

2x10^-7 M <-- did you factor in the M?

sweetburger · Answer

you do know m means meters right?

vera_ewing · Answer

Ok so what should I choose for my answer? I have to move on to the next question...

sweetburger · Answer

I would just put B. Idk i have studied this stuff in ages

sweetburger · Answer

havent*