Question #333163

**Question 3**

If the velocity of sound in a solid is of the order 10^{3} m/s, compare the frequency of the sound wave λ = 20 Å for (a) a monoatomic system and (b) acoustic waves and optical waves in a diatomic system containing two identical atoms (M=m) per unit cell of interatomic spacing 2.2 Å.

**Question 4**

4.1 The conductivity of silver is 6.5 x10^{7 }per Ohm per m and number of conduction electrons per m^{3 }is 6x10^{28 }Find the mobility of conduction electrons and the drift velocity in an electric field of 1 V/m. Given m = 9.1 x 10^{-31}kg and e=1.602 x 10^{-19}C.

4.2 What is Lorentz number? The thermal and electrical conductivities of Cu at 20^{o}C are 390 Wm^{-1}K^{-1 }and 5.87x10^{7}W^{-1}m^{-1} respectively. Calculate Lorentz number.

Service report

It's been a while since this question is posted here.
Still, the answer hasn't been got.
Consider converting this question to a fully qualified assignment, and we will try to assist.
Please click the link below to proceed: Submit order

Learn more about our help with Assignments: Solid State Physics

## Comments

## Leave a comment