Question

Lycopodium powder is lightly sprinkled on a clean water surface in a large tray and observed using a hand lens. A red hot needle is plunged into the centre of the water surface. State and explain what is observed

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

The powder around the hot needle moves away.

Reason

- The high temperature of the needle lowers the surface tension of the water around it.

- High surface tension on the sided pits the powder away