<u>Answer:</u> The correct answer is lower, lower.
<u>Explanation:</u>
The relation between energy and wavelength of light is given by Planck's equation, which is:
.....(1)
where,
E = energy of the light
h = Planck's constant
c = speed of light
= wavelength of light
We also know that:
......(2)
where,
= frequency of light
From equation 1 and 2, we get that wavelength is inversely proportional to energy as well as frequency of the light. So, if the wavelength of light is high, that means energy and frequency will be low.
Hence, the correct answer is lower, lower.
Ok to answer this question we firsst need to fin the number of mol of Urea (CH4N2O). to do this we simply :
1 mol of urea =15/60.055 = 0.25mol
therefore 200g of water contain 0.25mol
the next step is to determine the malality of our solution in 200g of water, to do this we say:
200 g = 1Kg/1000g = 0.2kg
therefor 0.25mol/0.2Kg = 1.25mol/kg
and from the equation:
we know that i = 1
we are given Kf
b is the molality that we just calculated
therefore;
the solutions freezing point is -2.325°C
