Um so just a paragraph about Saturn?
Answer: The frequency of the green light emitted by a hydrogen atom with a wavelength of 546 nm is
.
Explanation:
Given: Wavelength = 546 nm
= 
The relation between frequency and wavelength is as follows.

where,
= frequency
c = speed of light = 
= wavelength
Substitute the values into above formula as follows.

Thus, we can conclude that the frequency of the green light emitted by a hydrogen atom with a wavelength of 546 nm is
.
Data:
solute: ethylene glicol => not ionization
molar mass of ethylene glicol (from internet) = 62.07 g/mol
solute = 400 g
solvent = water = 4.00 kg
m =?
ΔTf = ?
Kf = 1.86 °C/mol
Formulas:
m: number of moles of solute / kg of solvent
ΔTf = Kf*m
number of moles of solute = mass in grams / molar mass
Solution
number of moles of solute = 400 g / 62.07 g/mol = 6.44 moles
m = 6.44 mol / 4 kg = 1.61 m <-------- molality (answer)
ΔTf = 1.86 °C / m * 1.61 m = 2.99 °C <---- lowering if freezing point (answer)