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Recent questions tagged solid-state

A metal of density $7.5\times 10^3kgm^{-3}$ has an fcc crystal structure with lattice parameter $a=400$pm.Calculate the number of unit cells present in 0.015kg of the metal

asked Aug 1, 2014 by sreemathi.v

1 answer

The unit cell of metallic gold is face centred cubic.What is the mass of a gold unit cell?

asked Jul 31, 2014 by sreemathi.v

1 answer

The unit cell of metallic gold is face centred cubic.How many atoms occupy the gold unit cell?

asked Jul 31, 2014 by sreemathi.v

1 answer

At what angles with X-rays of wavelength $1.542\times 10^{-10}m$ undergo first order and second order reflections by planes separated by $3.5\times 10^{-10}m$?

asked Jul 31, 2014 by sreemathi.v

1 answer

Using X-rays of wavelength 154.1pm and starting from the glancing angle,the reflection from silver crystal was found to occur at $\theta=22.20^{\large\circ}$.Calculate the spacing between the planes of Ag atoms that gave rise to the above reflection.($\sin 22.20^{\large\circ}=0.3778$)

asked Jul 31, 2014 by sreemathi.v

1 answer

Calculate the angle at which second-order reflection will occur in an X-ray spectrometer when X-rays of 0.154nm are diffracted by the atoms of a crystal having distance b/w two planes at 404 pm

asked Jul 31, 2014 by sreemathi.v

1 answer

A sample of crystalline solid scatters a beam of X-rays of wavelength 70.93pm at an angle $2\theta$ of $14.66^{\large\circ}$.If this is a second order reflection (n=2),calculate the distance between the parallel planes of atoms from which the scattered beam appears to have been reflected.

asked Jul 31, 2014 by sreemathi.v

1 answer

Explain the following with suitable examples: 12-16 and 13-15 group compounds.

asked Jul 31, 2014 by sreemathi.v

1 answer

Explain the following with suitable examples: Antiferromagnetism

asked Jul 31, 2014 by sreemathi.v

1 answer

Explain the following with suitable examples: Ferrimagnetism

asked Jul 31, 2014 by sreemathi.v

1 answer

Explain the following with suitable examples: Paramagnetism

asked Jul 31, 2014 by sreemathi.v

1 answer

Explain the following with suitable examples: Ferromagnetism

asked Jul 31, 2014 by sreemathi.v

1 answer

If NaCl is doped with $10^{–3}$ mol % of $SrCl_2$, what is the concentration of cation vacancies?

asked Jul 31, 2014 by sreemathi.v

1 answer

Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.How many unit cells are there in $1.00cm^3$ of aluminium?

asked Jul 31, 2014 by sreemathi.v

1 answer

Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.What is the length of the side of the unit cell?

asked Jul 30, 2014 by sreemathi.v

1 answer

Explain the following term with suitable examples: F-centres

asked Jul 30, 2014 by sreemathi.v

1 answer

Explain the following term with suitable examples: Interstitials

asked Jul 30, 2014 by sreemathi.v

1 answer

Explain the following term with suitable examples: Frenkel defect

asked Jul 30, 2014 by sreemathi.v

1 answer

Explain the following term with suitable examples: Schottky defect

asked Jul 30, 2014 by sreemathi.v

1 answer

In terms of band theory, what is the difference between a conductor and a semiconductor

asked Jul 30, 2014 by sreemathi.v

1 answer

In terms of band theory, what is the difference between a conductor and an insulator

asked Jul 30, 2014 by sreemathi.v

1 answer

Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

asked Jul 30, 2014 by sreemathi.v

1 answer

Classify the following as being either a p-type or a n-type semiconductor: B doped with Si

asked Jul 30, 2014 by sreemathi.v

1 answer

Classify the following as being either a p-type or a n-type semiconductor: Ge doped with In

asked Jul 30, 2014 by sreemathi.v

1 answer

Ferric oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

asked Jul 30, 2014 by sreemathi.v

1 answer

Non-stoichiometric cuprous oxide, $Cu_2O$ can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2:1. Can you account for the fact that this substance is a p-type semiconductor?

asked Jul 30, 2014 by sreemathi.v

1 answer

What is a semiconductor? Describe the two main types of semiconductors and contrast their conduction mechanism.

asked Jul 30, 2014 by sreemathi.v

2 answers

Analysis shows that nickel oxide has the formula $Ni_{0.98}O_{1.00}$. What fractions of nickel exist as $Ni^{2+}$ and $Ni^{3+}$ ions?

asked Jul 30, 2014 by sreemathi.v

1 answer

Copper crystallises into a fcc lattice with edge length $3.6\times 10^{-8}$cm.Show that the calculated density is in agreement with its measured value of $8.92gcm^{-3}$.

asked Jul 30, 2014 by sreemathi.v

1 answer

If the radius of the octahedral void is r and radius of the atoms in close- packing is R, derive relation between r and R.

asked Jul 30, 2014 by sreemathi.v

1 answer

Niobium crystallises in body-centred cubic structure. If density is $8.55 g cm^{–3}$, calculate atomic radius of niobium using its atomic mass 93 u.

asked Jul 30, 2014 by sreemathi.v

1 answer

A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q?

asked Jul 30, 2014 by sreemathi.v

1 answer

Silver crystallises in fcc lattice.If edge length of the cell is $4.077\times 10^{-8}cm$ and density is $10.5gcm^{-3}$.Calculate the atomic mass of silver.

asked Jul 30, 2014 by sreemathi.v

1 answer

Calculate the efficiency of packing in case of a metal crystals for : face-centered cubic (with the assumptions that atoms are touching each other)

asked Jul 30, 2014 by sreemathi.v

1 answer

Calculate the efficiency of packing in case of a metal crystals for : body-centered cubic

asked Jul 30, 2014 by sreemathi.v

1 answer

Calculate the efficiency of packing in case of a metal crystals for : simple cubic

asked Jul 30, 2014 by sreemathi.v

1 answer

Explain : Ionic solids are hard and brittle

asked Jul 30, 2014 by sreemathi.v

1 answer

Explain : The basis of similarities and differences between metallic and ionic crystals.

asked Jul 30, 2014 by sreemathi.v

1 answer

How many lattice points are there in one unit cell of each of the following lattice?Body-centred

asked Jul 30, 2014 by sreemathi.v

1 answer

How many lattice points are there in one unit cell of each of the following lattice?Face-centred tetragonal

asked Jul 30, 2014 by sreemathi.v

1 answer

How many lattice points are there in one unit cell of each of the following lattice?Face-centred cubic

asked Jul 29, 2014 by sreemathi.v

1 answer

How will you distinguish between the following pair of terms:Tetrahedral void and octahedral void?

asked Jul 29, 2014 by sreemathi.v

1 answer

How will you distinguish between the following pair of terms:Crystal lattice and unit cell?

asked Jul 29, 2014 by sreemathi.v

1 answer

How will you distinguish between the following pair of terms:Hexagonal close-packing and cubic close-packing?

asked Jul 29, 2014 by sreemathi.v

1 answer

'Stability of a crystal is reflected in the magnitude of its melting points'. Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

asked Jul 29, 2014 by sreemathi.v

1 answer

How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.

asked Jul 29, 2014 by sreemathi.v

1 answer

What is the coordination number of atoms in a body centred cubic structure?

asked Jul 29, 2014 by sreemathi.v

1 answer

What is the coordination number of atoms in a cubic close-packed structure?

asked Jul 29, 2014 by sreemathi.v

1 answer

What is meant by the term 'coordination number'?

asked Jul 29, 2014 by sreemathi.v

1 answer

Classify the following solid as ionic, metallic, molecular, network (covalent) or amorphous.Si

asked Jul 29, 2014 by sreemathi.v

1 answer

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