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An electron is accelerated through a potential difference of 100 volts. Calculate de-Broglie wavelength in nm.
Concept: De Broglie Hypothesis
To convert a moving coil galvanometer into an ammeter we need to connect a ______.
Concept: Moving Coil Galvanometer
In a photoelectric experiment, the stopping potential is 1.5V. What is the maximum kinetic energy of a photoelectron?
Concept: The Photoelectric Effect
Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.
Concept: Magnetic Properties of Materials
The decay constant of radioactive substance is 4.33 x 10-4 per year. Calculate its half life period.
Concept: Law of Radioactive Decay
Linear momentum of an electron in Bohr orbit of H-atom (principal quantum number n) is proportional to ______.
Concept: Bohr’s Atomic Model
A circular coil of 300 turns and average area 5 * 10-3m2 carries a current of 15A. Calculate the magnitude of magnetic moment associated with the coil.
Concept: Magnetic Dipole Moment of a Revolving Electron
Which of the following substances is ductile?
Concept: Magnetic Properties of Materials
Give any ‘two’ points of differences between diamagnetic and ferromagnetic substances.
Concept: Magnetic Properties of Materials
In a hydrogen atom, an electron carrying charge 'e' revolves in an orbit of radius 'r' with speed 'v'. Obtain an expression for the magnitude of magnetic moment of a revolving electron.
Concept: Current Loop as a Magnetic Dipole: Magnetic Dipole Moment of Current Loop
The magnetic moment of a magnet of dimensions 5 cm × 2.5 cm × 1.25 cm is 3 Am2. Calculate the intensity of magnetization.
Concept: Magnetisation and Magnetic Intensity
Derive an expression for the total energy of electron in ‘n' th Bohr orbit. Hence show that energy of the electron is inversely proportional to the square of principal quantum number. Also define binding energy.
Concept: Mass-energy and Nuclear Binding Energy >> Nuclear Binding Energy
The susceptibility of magnesium at 200 K is 1.8 x 10-5. At what temperature will the susceptibility decrease by 6 x 10-6?
Concept: Magnetic Properties of Materials
Show that the orbital magnetic dipole moment of a revolving electron is `(eVr)/2`
Concept: Magnetic Dipole Moment of a Revolving Electron
An electron in an atom revolves around the nucleus in an orbit of radius 0.53 Å. If the frequency of revolution of an electron is 9 x109 MHz, calculate the orbital angular momentum
[Given : Charge on an electron = 1.6 x 10–19 C; Gyromagnetic ratio = 8.8 x 1010 C/kg; π = 3.142]
Concept: Magnetic Dipole Moment of a Revolving Electron
Find the magnetization of a bar magnet of length 10 cm and cross-sectional area 4 cm2, if the magnetic moment is 2 Am2.
Concept: Magnetisation and Magnetic Intensity
A meter gauge train is heading north with speed 54 km/hr in earth's magnetic field 3 x 10-4T. The e.m.f. induced across the axle joining the wheels is ..........
(a) 0.45 mV
(b) 4.5 mV
(c) 45 mV
(d) 450 m V
Concept: Magnetic Properties of Materials
Draw the diagrams showing the dipole moments in paramagnetic substance when external magnetic field is (a) absent (b) strong
Concept: Magnetic Dipole Moment of a Revolving Electron
Represent Radioactive Decay curve using relation `N = N_o e^(-lambdat)` graphically
Concept: Law of Radioactive Decay
The magnetic susceptibility of annealed iron at saturation is 4224. Find the permeability of
annealed iron at saturation. (μ0 = 4Π × 10−7 SI unit)
Concept: Magnetic Properties of Materials
