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

Options

A. Decreases by a factor 20
B. Decreases by a factor 10
C. Inreases by a factor 20
D. Inceases by a factor 10

Answer

D

Explanation

Since, frequency is same in both the medium - `lambda prop v`
Increases by a factor 10 as `lambda_(2)=10lambda_(1)`.