Atomic and Nuclear Physics Answers

1. A metal rod is cooled from 75 °C to –20 °C, and the length is held constant. The linear coefficient of thermal expansion of the metal is 17 × 10^–6 (°C)^–1, and its elastic modulus is 210 GPa. Determine the magnitude and type of stress developed during the cooling.              

1. To what temperature would 18.75 g of an iron specimen initially at 20 °C be raised if 1000 Joules of heat are supplied? (The specific heat capacity of iron is 0.46 J/g °C.)   

For a metal that has an electrical conductivity of 5.1 × 10⁷ (Ω-m)^–1:

1. Calculate the resistance of a wire 3.5 mm in diameter and 7.5 m long.                

1. Calculate the current if the potential drop across the ends of the wire is 0.05 V.                

1. Calculate the current density.                                                

1. Compute the magnitude of the electric field across the ends of the wire.               

A coil of wire 7 m long and with 220 turns carries a current of 1.6 A.            

1. What is the magnitude of the magnetic field strength?                   

1. Calculate the flux density if the coil is in a vacuum. 
2. (Permeability of a vacuum is 1.257 × 10^–6H/m.)                       

1. Calculate the flux density inside a bar of carbon steel that is positioned within the coil. 

1. Briefly explain the following optical classification of materials:                  [3]

-Transparent materials

-Translucent materials

- Opaque materials

1. A light beam in air hits a sheet of crown glass. Compute the velocity of light in crown glass.
2. (n_air = 1.0003, n_{crown glass} = 1.52, c = 3 × 10⁸m/s).        

Find the solution to the “half” harmonic oscillator:

v ( x ) = 03 x < o

= $kx2 x > 0

Compare the energy values and wave functions with those of the full

harmonic oscillator. Why are some of the full solutions present and some

missing in the “half” problem?

three identical spin -1/2 fermions are to be distributed in two non degenerate distinct energy levels the number of ways this can be done is ans is 2 pls give solution

three identical spin -1/2 fermions are to be distributed in two non degenerate distinct energy levels the number of ways this can be done is pls give solution ans is 2

1. Sodium has mass number 22.9 and density 970 kg/m^3.

Find a) free electron concentration.

b) fermi wave number

C) fermi energy and velocity.

three identical spin -1/2 fermions are to be distributed in two non degenerate distinct energy levels the number of ways this can be done is