Red light has a wavelength of 700 nm and a frequency of 4.3 x 10^14 s-1. What is the energy of a single photon of red light?

A. 2.85 x 10^-20 J
B. 2.85 x 10^-19 J
C. 2.85 x 10^19 J
D. 2.85 x 10^-34 J

Question

Red light has a wavelength of 700 nm and a frequency of 4.3 x 10^14 s-1. What is the energy of a single photon of red light?

 		A.	2.85 x 10^-20 J
 		B.	2.85 x 10^-19 J
 		C.	2.85 x 10^19 J
 		D.	2.85 x 10^-34 J

vera_ewing · Answer

@aaronq D right?

aaronq · Answer

you used $E=\dfrac{hc}{\lambda }=h\nu$ ?

aaronq · Answer

D is too small

vera_ewing · Answer

yeah and i got D as my answer...

vera_ewing · Answer

@aaronq I'm pretty sure it's D though...

abb0t · Answer

Nope.

vera_ewing · Answer

@abb0t Well if it's not D then it must be C right?

aaronq · Answer

i doubt it, that energy is unmeasurable.

aaronq · Answer

that was about D, not C

aaronq · Answer

post what you did

vera_ewing · Answer

i can't @aaronq i don't know how to get it all on here...

aaronq · Answer

you dont have to do all the fancy $\LaTeX$ stuff, just post it like text

vera_ewing · Answer

nvm i submitted it and i got it right. thanks though! :)

aaronq · Answer

the answer is 2.838e-19

aaronq · Answer

that is weird. no problem though