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Answers to odd-numbered Conceptual Questions

Chapter 16, Problem 9CQ

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QUESTION:

Problem 9CQ

Answers to odd-numbered Conceptual Questions can be found in the back of the book.

Why do you hear creaking and groaning sounds in a house, particularly at night as the air temperature drops?

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QUESTION:

Problem 9CQ

Answers to odd-numbered Conceptual Questions can be found in the back of the book.

Why do you hear creaking and groaning sounds in a house, particularly at night as the air temperature drops?

ANSWER:

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Our houses are made of wood, glass, metal... In different conditions all of them expand or contract. When a house is colder (usually at night), these materials may move(contract) slightly and make noise. In general an increase in temperature will produce an increase in volume (apart from a few materials). A decrease in temperature will produce a decrease in volume. That's why we hear sounds; materials are adjusting to current conditions.

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