In which of the following process, convection does not take place primarily [2005]

Question

In which of the following process, convection does not take place primarily [2005]

Smart Achievers · Accepted Answer

(4)

Warming of glass of bulb due to filament is primarily due to radiation. A medium is required for convection process. As a bulb is almost evacuated, heat from the filament is transmitted through radiation.

Solution

Q.
In which of the following process, convection does not take place primarily [2005]

1 sea and land breeze

2 boiling of water

3 heating air around a furnace

4 warming of glass of bulb due to filament

Ans.
(4)

Warming of glass of bulb due to filament is primarily due to radiation. A medium is required for convection process. As a bulb is almost evacuated, heat from the filament is transmitted through radiation.

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