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.
--------
Question: Question: If Mona is bouncing radar waves off a test car when training to be a policewoman and she notices the frequency of the waves returning to her radar gun is lower then it was before, what is happening to the car she is pointing the gun at? 
 Answer: decreasing in speed

Answer: A: As the car approaches the radar gun, the reflected microwaves get bunched up in front of the car. Therefore, the waves the receiver detects have a higher frequency than they would if they were being reflected from a stationary object. The faster the car is moving, the greater the increase in the frequency of the waves.


Question: Question: John was in his office looking at the diagrams. He saw that as the lines were sparser, the fields were 
 Answer: Weaker

Answer: The closer the field lines are drawn together, the stronger the field being described.


Question: Question: A star that is blue in color is usually 
 Answer: hot

Answer:
But, in stars, the bluer the star, the hotter it is, and the redder it is, the older and colder it is.