For a plat plate (thickness , breadth b and height h) the heat exchange occurs from both the sides. The characteristics length is equal to

For a plat plate (thickness , breadth b and height h) the heat exchan

1.	For a plat plate (thickness , breadth b and height h) the heat exchange occurs from both the sides. The characteristics length is equal to
A.	/4
B.	/3
C.	/2
D.
Answer» D.