Silicon for computer chips is grown in large cylinders called “boules” that are

Question

Silicon for computer chips is grown in large cylinders called “boules” that are 300 mm in diameter and 2 m in length,as shown.(Figure 1) The density of silicon is 2.33 g/cm3. Silicon wafers for making integrated circuits are sliced from a 2.0 m boule and are typically 0.75 mm thick and 300. mm in diameter. How many wafers can be cut from a single boule? Express your answer using two significant figures What is the mass of a silicon wafer? (The volume of a cylinder is given by r2h, where r is the radius and h is its height.) Express your answer using two significant figures. What is the mass of a silicon wafer? (The volume of a cylinder is given by r2h, where r is the radius and h is its height.) Express your answer using two significant figures. What is the mass of a silicon wafer? (The volume of a cylinder is given by r2h, where r is the radius and h is its height.) Express your answer using two significant figures. What is the mass of a silicon wafer? (The volume of a cylinder is given by r2h, where r is the radius and h is its height.) Express your answer using two significant figures.

Explanation / Answer

1). Number of wwafers that can be sliced from a single boule=volume of single boule÷volume of single Si wafer=rboule2hboule/rwafer2hwafer

Number of wafers=2/0.75×10-3=2666.67

2). Mass=volume(cm3) ×density(g/cm3)=3.14×0.075×0.075×30×2.33=1.235g

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