Apparent frequncy of sound heard?

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The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. In summary, the frequency of the reflected sound from the car is 6001Hz, which is the apparent frequency received by the car. The apparent frequency reflected from the car is also 5455Hz due to the Doppler effect.
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desmond iking
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Homework Statement



A car is moving in a straight line at 30m/s approaches a stationary source which emits sound of frequency 5000hz. If the speed of sound is 330m/s . The apparent frequncy received by car is ((330+30)/ 330) x 5000= 5455hz.
What 's the frequency reflected form the car? the ans given is 6001hz.

why not the frequency received by the car = frequency of sound reflected by the car? which means the apparent frequency reflected form the car is also = 5455hz?

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The Attempt at a Solution

 
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  • #2
The reflected sound is at the frequency you say, but only when "heard" from the car. The car itself is a source moving with respect to the medium, in the direction of the emitted (reflected) sound.
 

1. What is the apparent frequency of sound heard?

The apparent frequency of sound heard is the perceived frequency of a sound wave by the human ear. It is not necessarily the same as the actual frequency of the sound wave, as other factors such as distance and medium can affect the perception of frequency.

2. How is the apparent frequency of sound heard different from the actual frequency?

The apparent frequency of sound heard can be different from the actual frequency due to the Doppler effect, which is the change in perceived frequency of a sound wave caused by the relative motion between the source of the sound and the observer. Other factors such as distance, medium, and the characteristics of the human ear can also contribute to the perceived difference in frequency.

3. What factors can affect the apparent frequency of sound heard?

The apparent frequency of sound heard can be affected by several factors such as distance, medium, temperature, and the characteristics of the human ear. The Doppler effect and other acoustic phenomena can also contribute to the perceived difference in frequency.

4. Can the apparent frequency of sound heard be measured?

Yes, the apparent frequency of sound heard can be measured using various instruments such as a frequency meter or an oscilloscope. However, the accuracy of the measurement may be affected by environmental factors and the limitations of the measuring instrument.

5. How is the apparent frequency of sound heard used in scientific research?

The apparent frequency of sound heard is used in various scientific disciplines such as acoustics, psychology, and audiology. It can be used to study the perception of sound by the human ear, the effects of different mediums on sound waves, and the behavior of sound in various environments. It is also an important factor in the development of technologies such as sound-based medical imaging and sonar systems.

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