The red line of the hydrogen emission spectrum has a wavelength of 656.1 nm. calculate the energy of one photon

The formula we can use here is the Plancks equation:

E = h c / ʎ

where h is Plancks constant = 6.626 × 10-34 m2 kg / s, c is speed of light = 3 x 10^8 m/s and ʎ is wavelength = 656.1 x 10^-9 m

Therefore E is:

E = (6.626 × 10-34 m2 kg / s) * (3 x 10^8 m/s) / 656.1 x 10^-9 m

E = 3.03 x 10^-19 J

The density would be p = 19.3 g/cm3 because

Explanation:  because if you calculate density the formula would be d = m

                                                                                                                             v

so just use the values giving and you get the answer  by plugging the 96.5 mass then 5 for the volume then divide it.