In the diagram, the mountaineer is able to hear the stream even though he cannot see it. As he moves nearer to the gully, he can both hear and see the stream. When he is farther away from the gully, he can neither hear nor see the stream. Which statement is not correct?
- AAs he approaches the gully edge, he hears first the short wavelength, higher frequencies and then the long wavelength, lower frequencies.
- BAs he approaches the gully edge, the sound becomes louder.
- CHe hears the stream because some of the sound is diffracted.
- DHe hears the stream because some of the sound is reflected from the opposite wall of the gully.