Recent questions tagged ch1

The Vacant space in body centered cubic lattice b.c.c unit cell is about

asked Feb 27, 2014 by sharmaaparna1

2 answers

Vanadium crystallises with a body centered cubic structure with a unit cell of side length $3.011A^{\large\circ}$. Calculate the atomic radius and density (V = 50.94)

asked Feb 27, 2014 by sharmaaparna1

1 answer

An electric line of force in the $xy$ plane is given by equation $x^2+y^2=1$. A particle with unit positive charge, initially at rest at the point $x = 1, y = 0$ in the $xy$ plane

asked Feb 27, 2014 by thanvigandhi_1

1 answer

The densities of NaCl crystal as measured by Spectrometer and X - ray method are $2.165\times10^3 kgm^{-3}$ and $2.178\times10^3 kgm^{-3}$, respectively . The fraction of unoccupied sites in sodium chloride crystal is

asked Feb 27, 2014 by sharmaaparna1

1 answer

$CsBr$ crystallises in a body centered cubic lattice. The unit cell length is $436.6\; pm$ . Given that the atomic mass of $Cs = 133$ and of $Br = 80\; amu$. Avogadro's number being $6.02\times10^{23}mol^{-1}$ The density of $CsBr$ is

asked Feb 27, 2014 by sharmaaparna1

1 answer

Silver (atomic weight = $107.88$) crystallises with f.c.c lattice for which the side length of the unit cell is $4.0774\overset{\circ}{A}$. Density of $Ag$ is $10.53\; g\;cm^{-3}$. Calculate the Avogadro's number.

asked Feb 27, 2014 by sharmaaparna1

1 answer

The angle at which first order reflection will occur when X-ray of wavelength $1.54A^{\large\circ}$ are diffracted by the atoms of a crystal ; the interplanar distance is $4.04A^{\large\circ}$

asked Feb 27, 2014 by sharmaaparna1

1 answer

CsBr has b.c.c structure with edge length $4.3 A^{\large\circ}$. The shortest inter ionic distance between $Cs^+$ and $Br^-$ is

asked Feb 27, 2014 by sharmaaparna1

1 answer

A metal M(at.wt = 40.0) depending on temperature crystallises in f.c.c and b.c.c structure whose unit cell length are 3.5 and $3.0 A^{\large\circ}$ respectively. The ratio of its densities in f.c.c and b.c.c structures is

asked Feb 25, 2014 by sharmaaparna1

1 answer

A unit cell of NaCl has four formula units. The edge length of unit cell is 0.564. The density of NaCl is

asked Feb 25, 2014 by sharmaaparna1

1 answer

Chromium metal crystallizes with a b.c.c lattice. The edge length of the unit cell is found to be 287pm. Calculate the density of chromium in $g\;cm^{-3}$(at weight of cr = 52).

asked Feb 24, 2014 by sharmaaparna1

1 answer

Four point charges $\;+8 \mu C\;,-1 \mu C\;,-1 \mu C\;and\;+8 \mu C\;$ are fixed at the points $\;-\sqrt{\large\frac{27}{2}} m \;,- \sqrt{\large\frac{3}{2}} m \;,+ \sqrt{\large\frac{3}{2}} m \;and\;+\sqrt{\large\frac{27}{2}} m\;$ respectively on the Y-axis . A particle of mass $\;6\times10^{-4} kg\;$ and charge $\;0.1 \mu C \;$ moves along the - X direction . It's speed at $\;x=+ \infty\;$ is $\;V_{0}\;. \quad \;$ Answer the following question based on the passage . Find the point on the x-axis where electric field is zero .

asked Feb 19, 2014 by yamini.v

1 answer

In a region a horizontal electric field $E = 15N/C$ is present. A ball having charge $2C$ , mass $3kg$ and coefficient of restitution with ground $\;\large\frac{1}{2}\;$ is projected at an angle $\;30^{\circ}\;$ with the horizontal distance travelled by ball from first drop to the second drop

asked Feb 19, 2014 by yamini.v

1 answer

Figure shows a closed dotted surface which intersects a conducting uncharged sphere . If a +ve charge is placed at the point P, the flux of the electric field through the closed surface

asked Feb 19, 2014 by yamini.v

1 answer

A non-conducting disc of radius a and uniform +ve surface charge density $\; \sigma\;$ is placed on the ground with it 's axis vertical . A particle of mass m and +ve charge q is dropped , along the axis of the disc from a height H with zero initial velocity . Find the value of H if the particle just reaches the disk .$\;\large\frac{q}{m}=4 \in_{0} g/\sigma$ . Find the position of particle at which the particle is in equilibrium. Find the energy of the particle at $\;H=\large\frac{a}{\sqrt{3}}\;$ assuming the gravitational energy at $\;H=0\;$ to be zero

asked Feb 19, 2014 by yamini.v

1 answer

A non-conducting disc of radius a and uniform +ve surface charge density $\; \sigma\;$ is placed on the ground with it 's axis vertical . A particle of mass m and +ve charge q is dropped , along the axis of the disc from a height H with zero initial velocity . Find the value of H if the particle just reaches the disk .$\;\large\frac{q}{m}=4 \in_{0} g/\sigma$ . Find the position of particle at which the particle is in equilibrium

asked Feb 18, 2014 by yamini.v

1 answer

A non-conducting disc of radius a and uniform +ve surface charge density $\; \sigma\;$ is placed on the ground with it 's axis vertical . A particle of mass m and +ve charge q is dropped , along the axis of the disc from a height H with zero initial velocity . Find the value of H if the particle just reaches the disk .$\;\large\frac{q}{m}$$=4 \in_{0} g/\sigma$

asked Feb 18, 2014 by yamini.v

1 answer

The region between two concentric shells of radii a and b $\;(b > a)\;$ contains volume charge density $\;\rho(r)=\large\frac{C}{r}\;$ , where C is a constant and r is the radial distance , as shown in figure . A point charge q is placed at the origin , r=0 . Find the value of C for which the electric field in the region between the spheres is constant.

asked Feb 18, 2014 by yamini.v

1 answer

A rectangular tank of mass $\;m_{0}\;$ and charge Q over it is placed over a smooth horizontal floor. A horizontal electric field E exist in the region . Rain drops are falling vertically in the tank at the constant rate of n drops per second . Mass of each drop is m . find velocity of tank as function of time .

asked Feb 18, 2014 by yamini.v

1 answer

The maximum electric field intensity inside a sphere of radiusR is

asked Feb 18, 2014 by yamini.v

1 answer

The point $\;r_{m}\;$ inside the sphere of a sphere of radius R at which electric field intensity is maximum , is given by

asked Feb 18, 2014 by yamini.v

1 answer

A mass m is to be placed on the rod of length L and pivoted at its centre at a distance x from the left end of the rod so that the system shown in figure remains in equilibrium . Find x (Ignore the force between Q (beaneth q ) and 2q and the force between Q (beneath 2q) and q .

asked Feb 18, 2014 by yamini.v

1 answer

If the radius of $Cs^+$ is 169pm and that of $Cl^-$ is 181pm then find the co-ordination number of $Cs^+$

asked Feb 18, 2014 by sharmaaparna1

1 answer