How is lambda=2l and lambda=4l...which one correct for echo?
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When a sound wave hits a wall, it is partially absorbed and partially reflected. A person far enough from the wall will hear the sound twice. This is an echo. In a small room the sound is also heard more than once, but the time differences are so small that the sound just seems to loom. This is known as reverberation.
Music is the sound that is produced by instruments or voices. To play most musical instruments you have to create standing waves on a string or in a tube or pipe. The perceived pitch of the sound is related to the frequency of the wave. The higher the frequency, the higher is the pitch.
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