Doppler effect is related to sound. It describes the change in frequency of sound waves due to relative motion between the source and observer. Approaching objects increase the frequency (higher pitch), while receding objects decrease it (lower pitch), affecting how sound is perceived based on the motion of the source or listener.
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The Doppler effect is related to sound (Option A). It explains the change in frequency of waves, whether sound or electromagnetic, due to relative motion between the source emitting the waves and the observer. When a sound source moves towards an observer, the sound waves are compressed, resulting in a higher frequency or pitch (called blue shift). Conversely, when the source moves away, the waves stretch, leading to a lower frequency or pitch (red shift). This phenomenon applies not only to sound waves but also to light waves and other types of waves. Understanding the Doppler effect is crucial in various fields, such as astronomy (to determine the motion of stars and galaxies), meteorology (to study weather patterns using Doppler radar), medicine (for Doppler ultrasound to measure blood flow), and in everyday applications like police radar for measuring vehicle speeds. It illustrates how motion affects wave properties and how these changes are perceived by observers, influencing our understanding of the universe and technological advancements.