a. rate of heat radiation from a surface per unit area

b. rate of heat radiation from a surface per unit solid angle

c. rate of heat radiation from a surface per unit area per unit solid angle

d. none of the above

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**ANSWER: c. rate of heat radiation from a surface per unit area per unit solid angle**

a. the ratio of spherical surface enclosed by a cone, with its vertex at the centre of sphere, to the radius of the sphere

b. the ratio of spherical surface enclosed by a cone, with its vertex at the centre of sphere, to the square of the radius of the sphere

c. the ratio of spherical surface enclosed by a cone, with its vertex at the centre of sphere, to the cube of the radius of the sphere

d. the ratio of spherical surface enclosed by a cone, with its vertex at the centre of sphere, to the fourth power of the radius of the sphere

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**ANSWER: b. the ratio of spherical surface enclosed by a cone, with its vertex at the centre of sphere, to the square of the radius of the sphere**

a. I = (E

b. I = π (E

c. I = 2 π (E

d. I =(1/π) (E

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**ANSWER: d. I =(1/π) (E _{b})**

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