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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
Write one balanced equation to show Emission of `beta^-` (i.e. a negative beta particle)
Concept: Atomic Masses and Composition of Nucleus
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
What is binding energy of a hydrogen atom?
Concept: Mass Defect and Binding Energy
Which logic gate corresponds to the truth table given below?
|
A |
B |
Y |
|
0 |
0 |
I |
|
0 |
1 |
0 |
|
1 |
0 |
0 |
|
1 |
1 |
0 |
Concept: Digital Electronics and Logic Gates
Explain the elementary idea of an oscillator with the help of block diagram
Concept: Oscillators
In a semiconductor, acceptor impurity is.................................
- antimony
- indium
- phosphorous
- arsenic
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
