When any substance (except water) is heated, its density:

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Increases

Decreases

Remains same

None of the above

answer is B.

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Detailed Solution

Concept: With the exception of water, all substances expand when heated. When a substance is heated, its internal energy increases. The distances between molecules grow wider due to their vibrations. As the distance between molecules increases, the material takes up more space. As a result, as the temperature rises, their volume increases.
As a result, we can generalize:
When the weather warms up:
The mass remains unchanged.
Volume goes up
As a result, density =

\frac{mass}{volume}

In the diffraction, the numerator remains constant while the denominator grows. Diffraction (=density) is frequently decreasing. So density decreases.
Hence, the correct option is 2.

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