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Assertion: Glass panes fixed to windows ...

Assertion: Glass panes fixed to windows or doors of old buildings are slightly thicker at the bottom than at the top .
Reason: Glass is a pseudo solid or supercooled liquid

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided in the statement. ### Step 1: Understand the Assertion The assertion states that glass panes fixed to windows or doors of old buildings are slightly thicker at the bottom than at the top. **Explanation**: This phenomenon occurs due to the nature of glass as an amorphous solid. Over time, gravity causes the glass to flow very slowly, which results in the bottom part of the glass pane becoming thicker than the top part. This is particularly noticeable in older buildings where glass was not manufactured with the same precision as today. ### Step 2: Understand the Reason The reason given is that glass is a pseudo solid or supercooled liquid. **Explanation**: Glass does not have a definite melting point like crystalline solids. Instead, it behaves like a supercooled liquid, which means that it has some fluid-like properties. This allows the molecules within the glass to move, albeit very slowly, which contributes to the thickening at the bottom of the pane over time. ### Step 3: Evaluate the Relationship Now we need to evaluate whether the reason correctly explains the assertion. - The assertion is true: Glass is indeed thicker at the bottom than at the top due to its slow flow under the influence of gravity. - The reason is also true: Glass is classified as an amorphous solid or pseudo solid, which behaves like a supercooled liquid. Since both the assertion and the reason are true, and the reason provides a correct explanation for the assertion, we conclude that the relationship between them is valid. ### Conclusion Both the assertion and the reason are true, and the reason is the correct explanation of the assertion. Therefore, the correct answer is that both the assertion and the reason are true, and the reason explains the assertion. ### Final Answer Both the assertion and the reason are true, and the reason is the correct explanation of the assertion. ---
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