Magnetic moment of `A^3+ion` is `5.48xx10^-23 J/T`. Find out the number of unpaired electrons in it. `(9.27xx10^-24 J/T=1B.M.)`

A transition metal compound has a magnetic moment of 3.9 BM. Calculate the number of unpaired electrons in the compound.

A magnetised needle of magnetic moment 4.8xx10^(-2)JT^(-1) is placed at 30^@ with the direction of uniform magnetic field of magnitude 3xx10^(-2)T . Calculate the torque acting on the needle.

If the mass of neutron is 1.7xx10^(-27) kg , then the de Broglie wavelength of neutron of energy 3eV is (h = 6.6xx10^(-34) J.s)

The number of silicon atoms per m^(3) is 5xx10^(28) . This is doped simultaneously with 5xx10^(22) atoms per m^(3) of arsenic and 5xx10^(20) atoms per m^(3) of indium. Calculate the number of electrons and holes . Given that n_(i)=1.5 xx10^(16) "m"^(-3) . Is the material n-type or p-type?

At 27^@C the average thermal energy of He atom is [K = 1.38 xx 10^-23 J]

Light of wavelength 4000 Å is incident on barium. The emitted photoelectrons describe a circle of radius 50 cm by a magnetic field of flux density 5.26 xx 10^(-6)T . What is the work function of barium in eV? Given, h = 6.6 xx 10^(-34)J.s, " " e = 1.6 xx 10^(-19)C, " " m_(e) = 9.1 xx 10^(-31) kg

If the value of Avogadro number is 6.023 xx 10^23 mol^(-1) and the value of Boltzmann constant is 1.380 xx 10 ^(-23) J K^(-1) , then the number of significant digits in the calculated value of the universal gas constant is

The volume of one atom of a metal M is 1.66xx10^(-23)cm^(3) . Find the atomic mass of M (given: density of M=2.7 g*cm^(-3) ).

Find out the temperature at which the average kinetic energy of a gas molecule will be equal to the energy gained by an electron on acceleration across a potential difference of 1V, Given Boltzman constant= 1.38 times 10^-23 J.K^-1 , charge of an electron = 1.6 times 10^-19 C .