Question

A balloon filled with CO₂, then for sound wave this will behave as a -

• A. Converging lens
• B. Diverging lens
• C. Both of the above
• D. None of the above

Answer 1

Answer: (A)

Converging lens

Answer 2

V_s =

> M_wair

$\mathrm { V } _ { \mathrm { CO } _ { 2 } }$ < V_air , velocity of sound decrease when sound propagate from air to CO₂ gas means CO₂ behave as a denser medium So wave bends towards normal, and CO₂ gas balloon behave as converging lens.