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A car moves towards a hill with speed `v_c`.It blows a horn of frequency f which is heard by an observer following the car with speed `v_0`.The speed of sound in air is v.A. the wavelength of sound reaching the hill is `v/f`B. the wavelength of sound reaching the hill is `(v-v_c)/f`C. The wavelength of sound of horn directly reaching the observer is `(v+v_c)/f`D. the best frequency observed by the observer is `(2v_x([email protected])f)/(v^2-v_c^2)` |
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Answer» Frequency of horn directly heard by observer `(v+v_0)/(v+v_c)f` Frequency of echo =`v/(v+v_c)f` Frequency of echo of horn as heard by observer. `v/(v-v_c)f.((v+v_0)/v)` Frequency of Beats : `=(v+v_0)f {1/(v-v_c)-1/(v+v_c)}=(2v_c(v+v_0))/((v_2-v_c^2))f` |
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