Anonymous
Anonymous asked in 科學其他:科學 · 1 decade ago

請問風速會影響都普勒效應嗎

兩車已30.5m/s之速度互相靠近

其中一輛發出頻率500Hz的聲音

請問另一輛車在

(a)風速0

(b)風速30.5m/s遠離觀察者

(c)風速30.5m/s吹向觀察者

時所聽到聲音頻率為?

能列一下算是嗎謝謝

1 Answer

Rating
  • Anonymous
    1 decade ago
    Favorite Answer

    (a)v=vw=340 m/s

    f'=(v+v0)f/(v-vs)=(340+30.5)*500/(340-30.5)=598.5 Hz

    (b)v=340-30.5=309.5 m/s

    f'=(v+v0)f/(v-vs)=(309.5+30.5)*500/(309.5-30.5)=609.3 Hz

    (c)v=340+30.5=370.5 m/s

    f'=(v+v0)f/(v-vs)=(370.5+30.5)*500/(370.5-30.5)=589.7 Hz

    2008-01-05 23:40:05 補充:

    vs:The car(frequency 500Hz)

    vw:The velocity of wind

    (b)The direction of v is opposite of wind.(To observer), so v=vw-v(wind)

    (c)The direction of v is the same of wind.(To observer), so v=vw+v(wind)

    Source(s): Me
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