JEE Main 2012 Physics question
This question has Statement 1 and Statement 2 . Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement 1: Bats emitting ultrasonic waves can detect the location of a prey by hearing the waves reflected from it. Statement 2: When the source and the detector are moving, the frequency of reflected waves is changed.
Answer: (3)
Solution
Bats locate prey by echolocation — timing the reflected ultrasonic echoes (Statement 1 true). The Doppler shift with moving source/detector is real
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