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Questions and Answers
What happens to the observed frequency when a sound wave source approaches a stationary observer?
What happens to the observed frequency when a sound wave source approaches a stationary observer?
- The observed frequency increases. (correct)
- The observed frequency is unrelated to the source frequency.
- The observed frequency remains constant.
- The observed frequency decreases.
In the Doppler effect formula, what does the symbol $v_s$ represent?
In the Doppler effect formula, what does the symbol $v_s$ represent?
- The speed of the observer.
- The speed of sound in the medium.
- The speed of the sound source relative to the observer. (correct)
- The speed of the wave propagation.
Using the formula $f_o = \frac{f_s v}{v \pm v_s}$, which sign is used when the sound source is moving away from the observer?
Using the formula $f_o = \frac{f_s v}{v \pm v_s}$, which sign is used when the sound source is moving away from the observer?
- Positive sign. (correct)
- Both signs can be used.
- Negative sign.
- No sign needed.
Which of the following statements best describes the Doppler effect?
Which of the following statements best describes the Doppler effect?
What is the implication of observing a higher frequency sound when a source moves towards an observer?
What is the implication of observing a higher frequency sound when a source moves towards an observer?
Flashcards
Doppler Effect
Doppler Effect
The change in frequency of a wave for an observer moving relative to the wave source.
Doppler Effect Formula
Doppler Effect Formula
fo = fs * v / (v ± vs)
Observed Frequency
Observed Frequency
The frequency of a wave as measured by an observer.
Source Frequency
Source Frequency
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Positive vs Negative Sign in Formula
Positive vs Negative Sign in Formula
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Study Notes
Doppler Effect (CIE AS Level Physics 9702)
- The Doppler effect occurs when the frequency of a wave, like sound, changes depending on the relative motion between the source and the observer.
- When a sound source moves relative to a stationary observer, the observed frequency is different from the source frequency.
- The formula for calculating the observed frequency is (f_o = \frac{f_s v}{v \pm v_s}).
- (f_o) is the observed frequency.
- (f_s) is the source frequency.
- (v) is the speed of sound.
- (v_s) is the speed of the source relative to the observer.
- The plus sign (+) is used when the source moves away from the observer.
- The minus sign (-) is used when the source moves towards the observer.
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