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State Bohr's postulate to define stable orbits in the hydrogen atom. How does de Broglie's hypothesis explain the stability of these orbits?
Concept: Bohr’s Model for Hydrogen Atom
Explain the processes of nuclear fission and nuclear fusion by using the plot of binding energy per nucleon (BE/A) versus the mass number A
Concept: Nuclear Fusion
A student wants to use two p-n junction diodes to convert alternating current into direct current. Draw the labelled circuit diagram she would use and explain how it works.
Concept: Diode or p-n Junction
Give three reasons why modulation of a message signal is necessary for long-distance transmission
Concept: Need for Modulation and Demodulation
Show graphically an audio signal, a carrier wave and an amplitude modulated wave
Concept: Need for Modulation and Demodulation
A carrier wave of peak voltage 15 V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%
Concept: Modulation and Its Necessity
In a potentiometer arrangement for determining the emf of a cell, the balance point of the cell in open circuit is 350 cm. When a resistance of 9 Ω is used in the external circuit of the cell, the balance point shifts to 300 cm. Determine the internal resistance of the cell.
Concept: Cells, EMF, and Internal Resistance
Write the underlying principle of a moving coil galvanometer.
Concept: Moving Coil Galvanometer
Define mutual inductance.
Concept: Inductance >> Mutual Inductance
What do you understand by the statement, "Electromagnetic waves transport momentum"?
Concept: Electromagnetic Spectrum
Draw a necessary arrangement for winding of primary and secondary coils in a step-up transformer. State its underlying principle and derive the relation between the primary and secondary voltages in terms of number of primary and secondary turns. Mention the two basic assumptions used in obtaining the above relation.
Concept: Inductance >> Mutual Inductance
Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.
Concept: Experimental Study of Photoelectric Effect
Write S.I unit of electric flux.
Concept: Electric Flux
Derive an expression for the mutual inductance of two long co-axial solenoids of same length wound one over the other,
Concept: Solenoid
Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer?
Concept: Moving Coil Galvanometer
Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.
Concept: Electromagnetic Spectrum
Write two uses of the following radiation.
X-rays
Concept: Electromagnetic Spectrum
Write two important limitations of a refracting telescope over a reflecting-type telescope.
Concept: Optical Instruments >> Telescope
With the help of a diagram, show how a plane wave is reflected from a surface. Hence, verify the law of reflection.
Concept: Reflection of a Plane Wave by a Plane Surface
