Give reasons for the following observation:

The smell of hot sizzling food reaches you several metres away , but to get the smell from cold food you have to go close.

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Cold food have high kinetic energy

None of the above

Hot food have low kinetic energy

Hot food have high kinetic energy

answer is A.

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Detailed Solution

Concept- Diffusion is the net movement of particles (e.g. atoms, ions, molecules) from an area of higher concentration to an area of lower concentration.
The smell of hot, sizzling food can be detected from a distance of several metres, but in order to smell cold food, you must get close to it. This is because hot, sizzling food particles have high kinetic energy, which allows them to diffuse quickly in the air and travel a distance of several metres, as opposed to cold food particles, which have low kinetic energy and cannot travel a distance of several metres.
Matter particles having kinetic energy are always in motion. Particles having low kinetic energy move slowly at lower temperatures. Due to the low temperatures, the particles in cold food have little kinetic energy. The particles of hot vapours from hot meals move quicker because they have a larger kinetic energy at higher temperatures.
Hence, the correct option is (1).

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