Question

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700Hz acoustic wave as it enters brass from warm air

• A. Decreases by a factor 20
• B. Decreases by a factor 10
• C. Increases by a factor 20
• D. Increases by a factor 10

Answer 1

The correct option is D Increases by a factor 10

$\therefore$ frequency is same in both the medium
$\therefore$ $\lambda \propto$ speed.