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The wavelength of the associated sound will increase. This will be noticed by the sound having a lower tone. As the sound passes through the solid object, not only will it sound lower in tone, it will sound softer, evidenced by if a person closes a door to a room and listens to a sound played from inside.

Answer:

Speed of sound wave increase.

Explanation:

There are many factors on which the speed of the sound wave depend i.e. temperature, density etc.

It also depends on the type of medium i.e. either solid, liquid or gas. It is maximum in solid than liquid and gases. It is about 6420 m/s in aluminium, 6040 m/s in nickel. In air the speed of the sound is least.

Hence, as we move from the air through a soil, the speed of the sound increase.

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