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All India - 2016 (South)
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Q9 of 26 Page 1

Write the function of a (i) transducer and (ii) repeater in a communication system.

(i) TRANSDUCER: A transducer is a device used for converting one form of energy to another. Eg. A Microphone converting sound energy to electrical energy.

(ii) REPEATER: A repeater receives a signal from a transmitter, amplifies the signal and then re-transmits it to receiver.


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7

State two properties of electromagnetic waves. How can we show that em waves carry momentum?

8

Write briefly the underlying principle used in Davison-Germer experiment to verify wave nature of electrons experimentally. What is the de-Broglie wavelength of an electron with kinetic energy (K.E.) 120 eV?

10

In the ground state of hydrogen atom, its Bohr radius is given as 5.33x10-11 m. The atom is excited such that the radius becomes 21.23x10-11 m. Find (i) the value of the principal quantum number and (ii) the total energy of the atom in this excited state.

OR


The energy levels of a hypothetical atom are shown below. Which of the shown transitions will result in the emission of photon of wavelength 275 nm?


11

Derive an expression for the electric field intensity at a point on the equatorial line of an electric dipole of dipole moment p and length 2a. What is the direction of this field?

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