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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
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
What are α and β parameters for a transistor? Obtain a relation between them.
Concept: Transistor and Characteristics of a Transistor
The output of NOR gate is high, when _______.
Concept: Digital Electronics and Logic Gates
Explain the formation of energy band diagram in case of conductor and semiconductor.
Concept: Energy Bands in Solids
Colour of light emitted by LED depends upon__________________ .
- its forward bias
- its reverse bias
- the band gap of the material of semiconductor
- its size
Concept: Special Purpose P-n Junction Diodes
In case of transistor oscillator, to obtain sustained oscillations, the product of voltage gain without feedback and feedback factor should be __________.
Concept: Oscillators
Explain the working of P-N junction diode in forward and reverse biased mode.
Concept: Semiconductor Diode
