The clocktower ("ghantaghar") of Dehradun is famous for the sound of its bell, which can be heard, albeit faintly, upto the outskirts of the city $8 \mathrm{km}$ away. Let the intensity of this faint sound be $30 \mathrm{dB}.$ The clock is situated $80 \mathrm{m}$ high. The intensity at the base of the tower is:-

• A

  $60 \mathrm{dB}$
• Correct answer
  B

  $70 \mathrm{dB}$
• C

  $80 \mathrm{dB}$
• D

  $90 \mathrm{dB}$

Hence, the correct answer is option: 'B'.