Here is the problem word for word:
"A sodium flame has a characteristic yellow color due to emissions of wavelength 589nm. What is the mass equivalence of one photon of this wavelength (1 J = 1kg*m^2/s^2)?"
Ok so I know the equation λ= h/mu, where h is plank's constant and u is the velocity of the particle. The question seemed simple enough but I realized that I don't know what u is.
And I also know the equation E= hv, and I can easily find out what v is by using c= v*λ, and so if I had E in joules, I thought it would be simple enough to perform some basic dimensional analysis on the unit J to get kg, but I just can't seem to get the answer.
Is it simpler than this?
The anwser is 3.75*10^(-36) Kg by the way.