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

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.

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

A copper tumbler feels much colder than a wooden block on a cold day. Explain why.

Thin people feel colder than fat ones. Give reason.

Explain why A has lower point than B ?

Explain why the nitration of anisole is much faster than the nitration of thioanisole under the same con- ditions.

Statement-1: On a cold winter day, an iron railing appears much colder than a wooden fence post. Statement-2: heat capacity of iron is different from wood.