Question

when a wave travels from one medium to another the wavelength change but not the frequency the wavelength of sound disturbance 30cm in air and of wave velocity is 340m/s what will be the wavelength of this disturbance in helium and water? the speed of sound in helium is 970m/s and 1450m/s .in water

Answer 1

$30 - 340 (970 - 1450$