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Draw a neat labelled diagram for Davisson and Germer experiment, for diffraction of electron wave.
Concept: Davisson and Germer Experiment
Calculate the radius of second Bohr orbit in hydrogen atom from the given data.
Mass of electron = 9.1 x 10-31kg
Charge on the electron = 1.6 x 10-19 C
Planck’s constant = 6.63 x 10-34 J-s.
Permittivity of free space = 8.85 x 10-12 C2/Nm2
Concept: Bohr’s Model for Hydrogen Atom
In a photon-electron collision ______.
(A) only total energy is conserved.
(B) only total momentum is conserved.
(C) both total energy and total momentum are conserved.
(D) both total momentum and total energy are not conserved
Concept: Forms of Energy > Nuclear Energy >> Nuclear Fusion – Energy Generation in Stars
Find the frequency of revolution of an electron in Bohr’s 2nd orbit; if the radius and speed of electron in that orbit is 2.14 × 10-10 m and 1.09 × 106 m/s respectively. [π= 3.142]
Concept: Bohr’s Model for Hydrogen Atom
Draw a neat, labelled energy level diagram for H atom showing the transitions. Explain the series of spectral lines for H atom, whose fixed inner orbit numbers are 3 and 4 respectively.
Concept: Bohr’s Model for Hydrogen Atom
Thorium 90Th232 is disintegrated into lead 82Pb200. Find the number of α and β particles emitted in disintegration.
Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
Find the ratio of longest wavelength in Paschen series to shortest wavelength in Balmer series.
Concept: Wavelength of an Electron
The ratio of kinetic energy of an electron in Bohr’s orbit to its total energy in the same orbit is
(A) – 1
(B) 2
(C) 1/2
(D) – 0.5
Concept: Bohr’s Model for Hydrogen Atom
In hydrogen atom Balmer series is obtained when the electron jumps from ............ .
(a) higher orbit to first orbit
(b) first orbit to a higher orbit
(c) higher orbit to the second orbit
(d) second orbit to a higher orbit
Concept: Wavelength of an Electron
What is de Broglie wavelength of an electron accelerated through 25000 volt?
Concept: Wavelength of an Electron
Light of wavelength 3000Å falls on a metal surface having work function 2.3 eV. Calculate the maximum velocity of ejected electrons
(Planck's constant h = 6.63 x 10-34 J.s., Velocity of light c = 3 x 108 m/s, mass of an electron = 9.1 x 10-31 kg)
Concept: Wavelength of an Electron
Represent Radioactive Decay curve using relation `N = N_o e^(-lambdat)` graphically
Concept: Law of Radioactive Decay
Write notes on Nuclear fission
Concept: Forms of Energy > Nuclear Energy >> Nuclear Fusion – Energy Generation in Stars
Write notes on Nuclear fusion
Concept: Forms of Energy > Nuclear Energy >> Nuclear Fusion – Energy Generation in Stars
What do you mean by polar molecules and non-polar molecules? Give ‘one’ example each.
Concept: Atomic Masses and Composition of Nucleus
Calculate the de-Broglie wavelength of an electron moving with one-fifth of the speed of light.Neglect relativistic effects. (`h = 6.63 xx 10^(-34)` J.s, c= `3xx10^8`m/s, mass of electron = `9 xx 10^(-31) kg)`
Concept: de-Broglie Relation
An electron of energy 150 eV has wavelength of 10-10m. The wavelength of a 0.60 keV electron is?
Concept: de-Broglie Relation
Using an expression for energy of electron, obtain the Bohr’s formula for hydrogen spectral lines.
Concept: Hydrogen Spectrum
An electron in hydrogen atom stays in its second orbit for 10−8 s. How many revolutions will it make around the nucleus at that time?
Concept: Mass-energy and Nuclear Binding Energy >> Nuclear Binding Energy
State the significance of binding energy per nucleon.
Concept: Mass-energy and Nuclear Binding Energy >> Nuclear Binding Energy
