|(I) During observer motion both frequency and wavelength will change|
|(II) During source motion both frequency and wavelength will change|
|(III) During source motion only frequency will change|
|(IV) During observer motion only frequency will change|
A) I, II
B) I, II
C) II, III
D) II, IV
Correct Answer: D
Solution :(Source) motion\[\lambda \], n both change, (Observer) motion only n change.
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