Question

JIJ UIUJCCI Sampie Prelab assignment (20%) 1) Based on the formulae below, explain in few words how is the enersy of light related to the wavelength, energy of the light wavelength Speed of light frequency of the light Erhv frequency Purd's constant 2) Which light between red and blue has the higher frequency? 3) The Amex of Mno, is 525 nm. What color of the visible spectrum does correspond to this wavelength? (use the visible spectrum image provided on canvas). 4) What is the actual color of a permanganate solution? What is the relationship between this color and the one that correspond to the answer to question (3)? (Use the visible spectrum image provided on D2L). 5) The Beer-Lambert law on page xx of your lab manual shows that the absorbance is proportional to the concentration of the colored substance. Based on that law, what kind of graph do you expect to find when plotting absorbance against concentration? Would the graph be linear or not? Would it pass though the origin or not?

Answer 1

Solution:

1) Energy of electromagnetic radiation is directly proportional to frequency of radiation.

E = h v

E = Energy

h = Plank's constant = 6.626 x 10^-34 erg s

v = Frequency

E = h v = h c /$\lambda$

Thus,

$\lambda$ = c / v

2) .The light having higher frequency corresponds to higher energy and lower wavelength. A red light has longer wavelength, hence posses lower frequency.

Thus, blue light has higher frequency.