Doppler Effect the change in wavelength due to motion of the source

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Presentation transcript:

Doppler Effect the change in wavelength due to motion of the source Examples: moving cars and trains moving buzzer in a nerf ball rotating whistle

Doppler Effect Doppler effect sounds like this: Weeeeeeeeeeeeeee …Ohhhhhhhhhhhhhh Doppler effect looks like this: Frequency differs depending on the observer’s location.

Hearing the doppler effect - denominator vmedium + vsource is used if source moving away from the observer - use vmedium – vsource if source moving towards observer

Example 1. The Batmobile is approaching Batgirl at a speed of 140km/h while sounding its horn. Calculate the apparent frequency of the horn heard by Batgirl if the sound has a frequency of 500Hz. Assume a speed of sound of 344 m/s.

Example 2. (p461). If the sound of the horn has a frequency of 500 Hz, calc the apparent frequency heard by Robin if the Batmobile is travelling at 140km/h away from him. Assume speed of sound of 344m/s.

Mach (Measurement of Sound Speed) A sonic boom occurs when an object goes faster than sound is able to travel. Water vapor appears as a suddenly condensed cloud as the jet creates a high density compression wave. This is referred to as breaking the SOUND BARRIER.

Thinking: What is a sonic boom?

Thinking: Why does the sound wave get to us after the jet has passed us? As a fast object approaches, observers on the ground are struck with incoming sound waves (like the wake of a motor boat).