A wave has a speed of 4500 m/s and a wavelength of 300 m in rock. It is transmitted into another material where its speed is 1500 m/s.
Which classifies the wave and gives its wavelength in the second material?
infrasound, 100 m100\ \mathrm{m}100 m
infrasound, 900 m900\ \mathrm{m}900 m
audible sound, 100 m100\ \mathrm{m}100 m
audible sound, 900 m900\ \mathrm{m}900 m