20. A box that does not allow the internal sound to come out and the external sound to enter in is called a _______________ box.
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A box that does not allow the internal sound to come out and the external sound to enter in is called a radio box.
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Explanation:
A soundproof enclosure is a room or space that has been built with special materials that will block sound waves from traveling indoors or outdoors. Soundproof enclosures are widely used in several scenarios wherein there is a requirement to prevent stray noises from entering the room.
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