Determine F12 and F21 for the following configurations: (a) A long semicircular duct with diameter of 0.1 meters: (b) A hemisphere-disk arrangement, with hemisphere diameter of 0.1 meters:

long duct: 1.0 and 0.424

Hemisphere 1.0 ; 0.125; 0.5

Explanation:

For a long duct:

By inspection,

Calculating by reciprocity,

Hemisphere:

By reciprocity gives = 0.125

using the summation rule:

However, because this is a hemisphere, the value will be= 0.5 * 1

                                                                                               = 0.5

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answer:

the answer is d

explanation: