what will happen if the reflector made of metal sheet in the experiment of verification of laws of reflection of sound is replaced by a cardboard?
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The experiment shall not be successful as cardboard cannot reflect sound.
When a longitudinal sound wave strikes a flat surface, sound is reflected in a coherent manner provided that the dimension of the reflective surface is large compared to the wavelength of the sound.
Note that audible sound has a very wide frequency range (from 20 to about 17000 Hz), and thus a very wide range of wavelengths.
As a result, the overall nature of the reflection varies according to the texture and structure of the surface.
For example, porous materials will absorb some energy, and rough materials tend to reflect in many directions.
When a longitudinal sound wave strikes a flat surface, sound is reflected in a coherent manner provided that the dimension of the reflective surface is large compared to the wavelength of the sound.
Note that audible sound has a very wide frequency range (from 20 to about 17000 Hz), and thus a very wide range of wavelengths.
As a result, the overall nature of the reflection varies according to the texture and structure of the surface.
For example, porous materials will absorb some energy, and rough materials tend to reflect in many directions.
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