12) based on the appropriate wavelength of light absorbed by the following mater
ID: 526313 • Letter: 1
Question
12) based on the appropriate wavelength of light absorbed by the following material which has smallest band gap?
13) iron crystallizes in a body centered cubic pattern. how many iron atom are in each unit cell?
14) what describes mangalloy
12) Based on the appropriate wavelength of light absorbed by the following materials, which one has the smallest band gap? D) boron-doped diamond, 675 nm B) gallium nitride, 371 nm E) nitrogen-doped diamond, A 425 nm C) indium nitride, 3620 nm 13) Iron crystallizes in a body-centered cubic pattern. How many iron atoms are in each unit cell? A) 1 D) 6 B) 2 C) 4 E) 8 14) Mangalloy is a nonmagnetic steel with extreme anti-wear properties. It contains approximately 0.8- 1.25% carbon (r 77pm) and 11-15% manganese (r 127 pm), along with iron (r 126 pm). Mangalloy is a A) a substitutional alloy B) an interstitial alloy C) both an interstitial and substitutional alloy D) a colloidal alloy E) an intermetallic compoundExplanation / Answer
12)
E = h*c/wavelength
for E to be small, wavelength should be large
Largest wavelength is for boron-doped diamond
So, it will have smallest band gap
Answer: boron-doped diamond
13)
for BCC,
8 atoms are at corners with contribution of 1/8
1 atom is at body center with contribution of 1
Total number of atoms = 8*(1/8) + 1*(1) = 2
Answer: B
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