When the source is at the center of the circle and the observer is moving on the circumference of the circle, sound heard by the observer is:
Correct answer: C. Same
- A. Increasing
- B. Decreasing
- C. Same
- D. Different
Explanation
The radius(distance between observer and source) of the circle is the same at every point of the circumference. Hence, the observer moving along the circumference of the circle will experience no change in frequency since there is no change in the distance.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Speed of Sound
The speed of sound depends on the properties of the medium, including its elasticity and density, and in gases it varies mainly with temperature. Questions connect speed with frequency and wavelength, compare sound in solids, liquids and gases, and distinguish the speed of propagation from the oscillating particles' motion.
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