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Heat Transfers from Hot Body to Cold Body

A brass tumbl...

Question

A brass tumbler feels much colder than a wooden tray on a chilly day. Explain why.

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Solution

Both brass and wood are at the same temperature. However, as brass is a good conductor of heat, it allows heat from our body to flow through it quickly. So it feels colder. On the other hand, wood is a poor conductor and doesn't allow heat to flow easily.

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Q. Assertion :A brass tumbler feels much colder than a wooden tray on a chilly day. Reason: The thermal conductivity of brass is less than that of wood.

Q. Assertion :A brass tumbler feels much colder than a wooden tray on a chilly day. Reason: The ability to conduct heat of brass is less than that of wood.

Q. Why a brass tumbler feels much cooler than a wooden tray?

Q. Explain why :
(a) A body with large reflectivity is a poor emitter
(b) A brass tumbler feels much colder than a wooden tray on a chilly day
(c) An optical pyrometer (for measuring high temperatures ) calibrated for an ideal black body radiation gives too low a value for the temperature of a red hot iron piece in the open but gives a correct value for the temperature when the same piece is in the furnace
(d) The earth without its atmosphere would be inhospitably cold
(e) Heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water

Q. Statement-1
On a chilly day, the metallic cap of a pen feels much colder than the plastic body although both are at the same (room) temperature.
Statement-2
Metal has a higher coefficient of thermal conductivity than plastic.

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Heat Transfers from Hot Body to Cold Body

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