Definition: 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.
Input: Question: John was watching the sound waves in his electronic monitor when he noticed something. The speed of the sound waves was faster when the temperature was 
 Answer: higher
Output:
For a given medium, sound waves travel more slowly at lower temperatures.