Its_me_aka_ak wrote:
Why not E?
Yes, Chromos excite the electrons but they need discrete quantal amounts of energy to do so. Bingo
comparing to option D which says that 'some' components of molecules 'will switch' to higher levels.
there are 2 problems with this option as per my understanding.
1. nowhere in the passage there's mentioned that only 'some' get excited
2. they do not 'switch' to higher level themselves it is a process that includes photons
Option (E) suggests that the chromophores, when exposed to light waves in the 290–320 nm range, will promote the discrete quantal amounts of energy required to excite electrons between energy levels. This statement is incorrect based on the principles described in the passage. The correct behavior of chromophores in this context is that they absorb photons of specific wavelengths, promoting electrons to higher energy levels, not exciting electrons between energy levels in discrete quantal amounts.
In summary, the passage explains that the chromophores in chemical absorbing sunscreens absorb specific wavelengths of light (e.g., in the UVB range, 290–320 nm), promoting electrons to higher energy levels. When these electrons later return to the ground state, they emit light at longer wavelengths.
Option (E) inaccurately describes the behavior of chromophores, making it an incorrect inference.