Which of the following is correct in Doppler s effect in one dimensional motion of source and observer A If source and observer

Question

Which of the following is correct in Doppler s effect in one dimensional motion of source and observer A If source and observer are both moving with same velocity wavelength will remain same B If source is receding away from observer with constant acceleration starting from rest then apparent frequency will continuously decrease C If observer is receding away from source which is emitting sound since very long with constant acceleration starting from rest then apparent frequency will first decrease then increase and finally no frequency will be detected by observer D If observer is moving towards source with constant acceleration starting from rest then apparent frequency received by observer will continuously increase

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