For intrinsic gallium arsenide, the room temperature electrical conductivity is 10€ (2-m)-¹; the electron and hole motilities are, respectively 0.85 and 0.04 m²/V-s. Compute the intrinsic carrier concentration n, at room temperature.

Show the miller-bravais index for a HCP structure.

Q1/A Prove that the volume of an FCC unit cell, Vc is; Vc = 16R³√2 B) Explain in general terms, why many polymers and some ceramic glasses have an amorphous or semicrystalline structure.

The activity of a radioisotope is found to decrease by 30% in one week; thatis, after one week, 70% of the original sample is left. What are the values of its (a) decayconstant in reciprocal seconds and (b) half-life in seconds?

O h. 0.74 Silver (Ag) has the FCC crystal structure. The atomic radius is R = 0.144 nm and the atomic mass is M = 107.87 g/mole. What is the density of Silver in g/m? Given: Avogadro's Number NA = 0.6023 x 1024 (atoms/mole) Select one: a. 10.6x106 O b. 10.6×105 O c. 10.6×10 O d. 10.60 O e. 10.6x10 Chromium (Cr) has the Boody-Centered Cubic (BCC) crystal structure. The edge length is a= 0.288 nm. What is the linear density in atoms/nm along direction (111P Select one: 9:12 PM O a. 7.48 O O e 4) A ENG 15-Apr-2021

The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytosine bonds with guanine. The figure (Figure 1) shows the thymine- adenine bond. Each charge shown is te, and the H-N distance is 0.110 nm

Diffusion of reactant atoms/molecules take place during the formation of silicon oxide. A. What is characteristic for the diffusion of these processes? B. What is the thickness of silicon lost during the formation of 2 um of SiO2?

Vanadium (V) has a BCC crystal structure. The atomic radius is R = 0.132 nm and the atomic mass is M = 50.94 g/mole. What is the density of Vanadium in g/mm3? Given: Avogadro’s Number NA = 0.6023 × 1024 (atoms/mole) Select one: a. 1.5 b. 0.021 c. 0.011 d. 0.0087 e. 0.00597

The crystalline density of polypropyleneis 0.946 g>cm3, and its amorphous densityis 0.855 g>cm3. What is the weight percentof the structure that is crystalline ina polypropylene that has a density of0.9 g>cm3?

(c) Sketch the hysteresis loop of the B-H curve for a ferromagnetic material with proper labels at room temperature. (d) Calculate the electrical conductivity of a 6.0 mm diameter cylindrical silicon specimen of 60 mm long in which a current of 0.5 A passes in an axial direction. A voltage of 12.5 V is measured across two probes that are separated by 40 mm. i. Compute the electrical conductivity of the specimen. ii. Compute the resistance over the entire 60 mm of the specimen using the data in (i).