Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.084027777777778

0.16736111111111

0.042361111111111

0.043055555555556

0.084027777777778

0.16736111111111

0.042361111111111

0.043055555555556

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Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Kirchhoff’s law

Planck’s law

Stefan’s law

Wine’s law

Kirchhoff’s law

Planck’s law

Stefan’s law

Wine’s law

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Heat and Mass Transfer
The heat transfer takes place according to

Kirchhoff's law

Second law of thermodynamics

Zeroth law of thermodynamics

First law of thermodynamics

Kirchhoff's law

Second law of thermodynamics

Zeroth law of thermodynamics

First law of thermodynamics

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Heat and Mass Transfer
The radiation emitted by a black body is known as

All of these

Full radiation

Total radiation

Black radiation

All of these

Full radiation

Total radiation

Black radiation

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Heat and Mass Transfer
Fourier's law of heat conduction is valid for

One dimensional cases only

Two dimensional cases only

Three dimensional cases only

Regular surfaces having non-uniform temperature gradients

One dimensional cases only

Two dimensional cases only

Three dimensional cases only

Regular surfaces having non-uniform temperature gradients

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

P= 1, T = 0 and a = 0

X = 0, a + p = 0

P = 0, x = 1 and a = 0

P = 0, x = 0 and a = 1

P= 1, T = 0 and a = 0

X = 0, a + p = 0

P = 0, x = 1 and a = 0

P = 0, x = 0 and a = 1

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Heat and Mass Transfer

Heat and Mass Transfer Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

Heat and Mass Transfer The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer The heat transfer takes place according to

Heat and Mass Transfer The radiation emitted by a black body is known as

Heat and Mass Transfer Fourier's law of heat conduction is valid for

Heat and Mass Transfer Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer
The heat transfer takes place according to

Heat and Mass Transfer
The radiation emitted by a black body is known as

Heat and Mass Transfer
Fourier's law of heat conduction is valid for

Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)