. . . . . . . . is sputtered on the whole wafer. A. Silicon B. Calcium C. Potassium D. Aluminium

The correct answer is: Aluminium.

Aluminium is sputtered on the whole wafer because it is a good conductor of heat and electricity. It also has a low coefficient of thermal expansion, which means that it does not expand or contract much when the temperature changes. This makes it ideal for use in semiconductor devices, where it is used to create the thin layers of material that make up the transistors and other components.

Silicon, calcium, and potassium are all also used in semiconductor devices, but they are not as good conductors of heat and

132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube