| This question has Statement 1 and Statement 2. [JEE ONLINE 12-05-2012] |
| 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. |
A) Statement 1 is false. Statement 2 is true.
B) Statement 1 is true, Statement 2 is false.
C) Statement 1 is true. Statement 2 is true, Statement 2 is not the correct explanation of Statement 1.
D) Statement 1 is true. Statement 2 is true, Statement 2 is the correct explanation of Statement 1.
Correct Answer: C
Solution :
| [c] Bats catch the prey by hearing reflected ultrasonic waves. |
| When the source and the detector (observer) are moving, frequency of reflected waves change. This is according to Doppler's effect. |
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