Atomic and Nuclear Physics Answers

solve a uniformly capillary tube closed at one end contain dry air trapped by a thread of mecury 8.5*10m long. when the tube was held horizontally the length of the air column was 5.0^-2m when it was held vertically with the closed end downward length was 4.5*10^-2m determine the value of atmosphere pressure ( g=10m/s^-2) density of mecury 1.36*104kgm^-3

What normal force does a horizontal table exert on a 3.5kg book that sits at rest?

A 1200 kg car accelerates at 3 m/s

2

. What net force is the car experiencing during this acceleration?

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).        

An electrochemical cell consists of pure cadmium immersed in a solution of Cd²⁺ ions and pure nickel in a solution of Ni²⁺ ions. Assume that the standard electrode potentials for Ni and Cd are –0.250 V and –0.403 V, respectively.

1. If the cell is a standard one (ie, 1 M solution for both ions at 25 °C):
2. Which electrode will be oxidised and which electrode will be reduced?                         [2]
   
3. Write the oxidation reaction, reduction reaction, and overall electrochemical reaction.      [2]
   
4. Calculate the standard voltage that is generated.               [2]

1. If the concentrations of Cd²⁺ and Ni²⁺ ions are 0.3 M and 10^-4 M respectively, compute the cell potential at 25 °C.          

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?