Name 1. What is the order of magnitude of the number of iron (Fe) atoms in the h
ID: 2075848 • Letter: N
Question
Name 1. What is the order of magnitude of the number of iron (Fe) atoms in the head of a hammer (steel, half a kg)? a) A few billions bo 10 c) 10 10 2. "Optical" phonon vibration modes are possible in a. One atom base crystals b. Two (or more) atom base crystals c. Silicon crystals d. Aluminum crystals 3. Due to the discrete nature of the solid (made of atoms), the vibration modes (waves) are a. Weak b Damped Dispersive d. Diffracted 4. Which one of the relationships between frequency and wave number will show a "dispersive" character of the wave a. 5m/s k b. ki b b-constanr d. m/s
Explanation / Answer
12)
1.a; Using Quantum behaviour at low temperature we find this power law.
2.d At high temperature, classicaly it is same for all 3R.
3.a wavelength smaller than interspacing should be ignored.
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