Fluorescence works because the fluorescent molecule a. absorbs light at one wavelength and emits light at a longer wavelength. b. absorbs light at one wavelength and emits light at a shorter wavelength. c. absorbs light at one wavelength and emits light at the same wavelength. d. absorbs light at many wavelengths and emits light at many wavelengths.

a. absorbs light at one wavelength and emits light at a longer wavelength.

Explanation:

Fluorescence is a kind of luminescence in which there is the emission of the light by the substance which has absorbed light with more photon energy as compared to the emitted energy.

It occurs when the emitted light has longer wavelength because of lower energy as compared to the absorbed radiation.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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more than, less

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