How much energy in joules does a UV light (24 nm) have? (Enter two sig figs!) h = 6.626 x 10-34) s
C = 3.00 x 108 m/s
x 10-18)

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

where are the choice options?

catya your not at all which answer i've seen you do this on another question!