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What is a rectifier?
Concept: p-n Junction Diode as a Rectifier
What is the average value of alternating current over a complete cycle?
Concept: Power in AC Circuit
Explain the working of the n-p-n transistor in a common base configuration.
Concept: Bipolar Junction Transistor (BJT)
What is a Light Emitting Diode?
Concept: Special Purpose Junction Diodes
Draw Light Emitting Diode circuit symbol.
Concept: Special Purpose Junction Diodes
Derive the equation for a transformer.
Concept: Transformers
Define α.
Concept: Bipolar Junction Transistor (BJT)
Define β
Concept: Bipolar Junction Transistor (BJT)
The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is ______.
Concept: Inductance >> Self Inductance
The energy of photon of wavelength X is_____ .
[h = Planck’s constant, c = speed of light in vacuum]
Concept: Einstein’s Equation - Particle Nature of Light
The photoelectric work function for a metal surface is 2.3 eV. If the light of wavelength 6800A is incident on the surface of metal, find threshold frequency and incident frequency. Will there be an emission of photoelectrons or not?
[Velocity of light c = 3 x 108 m/s,
Planck’s constant, h = 6.63 * 10-34 Js ]
Concept: Photoelectric Effect - Hertz’s Observations
The threshold wavelength of silver is 3800Å. Calculate the maximum kinetic energy in eV of photoelectrons emitted, when ultraviolet light of wavelength 2600Å falls on it.
(Planck’s constant, h =6.63 x 1O-34J.s.,
Velocity of light in air, c = 3 x 108 m / s)
Concept: Einstein’s Equation - Particle Nature of Light
The photoelectric current in a photoelectric cell can be reduced to zero by a stopping potential of 1.8 volt. Monochromatic light of wavelength 2200Å is incident on the cathode. Find the maximum kinetic energy of the photoelectrons in joules. [Charge on electron = 1.6 x 10-19 C]
Concept: Photoelectric Effect - Hertz’s Observations
The momentum of a photon of de Broglie wavelength 5000Å is _______.
[Planck’s constant = 6.63 x10-34 J.s.]
Concept: Einstein’s Equation - Particle Nature of Light
Draw a neat labelled circuit diagram of experimental arrangement for study of photoelectric effect.
Concept: Photoelectric Effect - Hertz’s Observations
When radiations of wavelength λ1 and λ2 are incident on certain photosensitive, such that E1 > E2 . Then Planck's constant 'h' is ......................... .
(C = Velocity of light).
Concept: Einstein’s Equation - Particle Nature of Light
The photoelectric threshold wavelength of a metal is 230 nm. Determine the maximum kinetic energy in joule and in eV of the ejects electron for the metal surface when it is exposed to a radiation of wavelength 180 nm.
[Planck’s constant : h = 6.63 * 10-34 Js, Velocity of light : C = 3 * 108 m/s.]
Concept: Einstein’s Equation - Particle Nature of Light
Find the value of energy of electron in eV in the third Bohr orbit of hydrogen atom.
(Rydberg's constant (R) = 1· 097 x 107m - 1,Planck's constant (h) =6·63x10-34 J-s,Velocity of light in air (c) = 3 x 108m/ s.)
Concept: Einstein’s Equation - Particle Nature of Light
The photoelectric work function for a metal is 4.2 eV. If the stopping potential is 3V, find the threshold wavelength and maximum kinetic energy of emitted electrons.
(Velocity of light in air = 3 x 108m/s,
Planck's constant = 6·63 x10-34 J -s,
Charg.e ori electron = 1·6 x 10 -19 C)
Concept: Photoelectric Effect - Hertz’s Observations
