You are driving at a speed of 25 m/s when an ambulance, approaches from behind at 45 m/s and with a siren frequency of 1,400 Hz. El Niño has
lowered the temperature to a bitter -5°C. You hear a different frequency
from the siren before it passes you compared to after it passes you. What
is the difference in the frequencies you hear?

Asimply means that over time there was some sort of change.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.