question_answer

  When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remain the same. Do you hear echo sound on a hotter day?

Answer:

                  Since should have a minimum value of for echo to be reduced. On a hotter day the speed of sound increases, so distance  must be increased, but it is given to be same, so if temperature increases, it may not be possible to hear the echo.