$A$ 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)