What is doppler effect ? Class 11 physics ch15.?

Question

Answer

Reflection of sound is called doppler effect

Answer

Doppler Effect

An increase or decrease in the frequency of sound, light, or other waves as the source and observer move towards or away from each other.........

Answer

The apparent change in the frequency of sound due to relative motion of source, observer and medium  is called Doppler's  effect.

Answer

Doppler Effect:

The Doppler Effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. This effect is commonly observed in sound waves, light waves, and water waves.

Explanation:

- Basic Concept: When a sound source is moving towards an observer, the sound waves are compressed, resulting in a higher frequency and a higher pitch. Conversely, when the source is moving away, the waves are stretched, leading to a lower frequency and a lower pitch.

- Formula: The formula for calculating the Doppler Effect in sound waves is given by: f' = f ((v + vo)/(v + vs)), where f' is the observed frequency, f is the actual frequency, v is the speed of sound, vo is the velocity of the observer, and vs is the velocity of the source.

- Applications: The Doppler Effect is utilized in various fields such as weather forecasting (Doppler radar), medical imaging (Doppler ultrasound), and astronomy (redshift of stars).

- Types: There are two types of Doppler Effect - the 'positive' Doppler Effect when the observer is moving towards the source, and the 'negative' Doppler Effect when the observer is moving away from the source.

- Color Shift: In light waves, the Doppler Effect can cause a shift in the color of an object. For example, a star moving away from Earth may appear more red (redshift), while a star moving towards Earth may appear more blue (blueshift).

Conclusion:

The Doppler Effect plays a crucial role in understanding the behavior of waves and is essential in various scientific and technological applications. By studying this phenomenon, scientists can gain valuable insights into the movement of objects in the universe and improve technologies that rely on wave phenomena.

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