Question

beta-carotene is an organic compound with an orange color. the diagram above shows the ultraviolet spectrum of beta-carotene. which of the following statements is true about the absorption bands in the spectrum?

Answer 1

The two main absorption bands in the ultraviolet spectrum of beta-carotene are associated with transitions in electronic energy levels.

This means that when the molecule absorbs energy from ultraviolet light, electrons move from a lower energy level to a higher energy level, resulting in a decrease in absorbance.

The band in the region corresponding to shorter wavelengths:

The band in the region corresponding to shorter wavelengths has a lower absorbance than the band in the region corresponding to longer wavelengths because higher energy photons (shorter wavelength light) require more energy to excite the electrons and cause the transition, so less absorbance is observed.

The complete question:

Beta-carotene is an organic compound with an orange color. The diagram above shows the ultraviolet spectrum of beta-carotene. Which of the following statements is true about the absorption bands in the spectrum?

• The two main absorption bands are associated with transitions in electronic energy levels.
• The band in the region corresponding to shorter wavelengths shows a lower absorbance than  the band in the region corresponding to longer wavelengths.

Learn more about the ultraviolet spectrum:

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