A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature.
(a) Plate will cool fastest and cube the slowest
(b) Sphere will cool fastest and cube the slowest
(c) Plate will cool fastest and sphere the slowest
(d) Cube will cool fastest and plate the slowest.
A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature.
(a) Plate will cool fastest and cube the slowest
(b) Sphere will cool fastest and cube the slowest
(c) Plate will cool fastest and sphere the slowest
(d) Cube will cool fastest and plate the slowest.
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1 Answer
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This is a multiple choice answer as classified in NCERT Exemplar
(c) density = mass/volume as density is same so volume is also same.
According to Stefan’s law H AT4 where A is the area and T is the temperature
Hsphere:Hcube:Hplate= Asphere:Acube:Aplate
As Aplate is maximum.
Hence the plate will cool the fastest.
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(b), (c), (d) When the hot milk in the table is transferred to the surroundings by conduction, convection and radiation.
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(a), (d) During the process AB temperature of the system is 00C . hence it represents phase change that is transformation of ice into water while temperature remains 00C.
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