Heat incident on a surface with given absorption and reflection coefficients: heat transmitted

1. A.
   $(a + r) \times t$
2. B.
   $\frac{(a + r)}{xt}$
3. C.
   $(1 - (a + r))xt$
4. D.
   $\frac{xt}{(a + r)}$

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1. A.
   7 kcal
2. B.
   12 kcal
3. C.
   15 kcal
4. D.
   22 kcal

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1. A.
   $100$ J
2. B.
   $500$ J
3. C.
   $700$ J
4. D.
   $900$ J

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