Easy
$A$ sound wave of frequency $v \text{ Hz}$ initially travels a distance of $1 \text{ km}$ in air. Then, it gets reflected into a water reservoir of depth $600 \text{ m}$. The frequency of the wave at the bottom of the reservoir is $(V_{\text{air}} = 340 \text{ m/s}, V_{\text{water}} = 1484 \text{ m/s})$
- A$> v \text{ Hz}$
- B$< v \text{ Hz}$
- C$v \text{ Hz}$
- D$0 \text{ Hz}$ (the sound wave gets attenuated by water completely)
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