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Consider a plane diaphragm which is a source of plane wave-fronts. (These wave-fronts are corresponding pressure maximas.) A stationary detector is placed in front of the source and detects a frequency 'f'. Assume initially the medium in which the waves propagate is also in rest and under initial conditions the seperation between successive wavefronts is 'l'. What are the changes in the values of 'l' and 'f' when [i] The source and medium both move towards the detector with the same velocity.[ii] The source moves towards the detector and the medium moves away from the detector with the same velocity.[iii] The source and medium both move towards the detector with different velocity.[iv] The source moves towards the detector and the medium moves away from the detector with different velocity.Explain with reasons. |
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Answer» Consider a plane diaphragm which is a source of plane wave-fronts. (These wave-fronts are corresponding pressure maximas.) A stationary detector is placed in front of the source and detects a frequency 'f'. Assume initially the medium in which the waves propagate is also in rest and under initial conditions the seperation between successive wavefronts is 'l'. What are the changes in the values of 'l' and 'f' when [i] The source and medium both move towards the detector with the same velocity. [ii] The source moves towards the detector and the medium moves away from the detector with the same velocity. [iii] The source and medium both move towards the detector with different velocity. [iv] The source moves towards the detector and the medium moves away from the detector with different velocity. Explain with reasons. |
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