solids have more dens than any type of matter and I am sure btw
Harmonic melody and something else hold on...checking
He thought elements that haven't been discovered belonged in the place of the gap. He could also use the atomic mass of the missing elements
The formuka to calculate energy of photon is
E=hc/ Lambda
where h is planks constant
c is velocity of light in vaccume
lamda is the wavelength.
Now
h= 6.626×10^-34 J s
c= 3×10^8 m/s
lamda=350 nanometers= 350×10^-9 m
hence
E=(6.626×10^-34×3×10^8)/(350×+0^-9)
=(19.878×10^-26)/(350×10^-9)
=0.567×10^-17
=5.67×10^-16 J