In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

[EX Q]: Question: Don sees wavelengths using a spectrometer. A wavelength that is very short likely has a _____ frequency compared to a longer one. 
 Answer: higher
[EX A]: Because all electromagnetic waves travel at the same speed through space, a wave with a shorter wavelength must have a higher frequency, and vice versa.

[EX Q]: Question: Mike is watching how particles of reactants function, and sees that they are very far apart. Considering that the concentration of them is very low, the chance of them colliding together is 
 Answer: low
[EX A]: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.

[EX Q]: Question: Don is getting screened for cancer. Because his cancer is caught late, after it had metastasized, the chance of a cure is 
 Answer: lesser
[EX A]:
The sooner cancer is treated, the greater the chances of a cure.