Q7 of 26 Page 1

A proton and an α particle are accelerated through the same potential difference. Which one of the two has (i) greater de- Broglie wavelength, and(ii) less kinetic energy? Justify your answer.

(i) The de-Broglie wavelength and accelerating potential are related as


, where


(



And


So,


As we know and


∴


(ii) The kinetic energy and accelerating potential are related as




And


∴


As we know


∴


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A signal of 5kHz frequency is amplitude modulated on a carrier wave of frequency 2MHz. What are the frequencies of the side bands produced?

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When 5V potential difference is applied across a wire of length 0.1, the drift speed of electrons is 2.5× 10-4m/s if the electron density in the wire is 8× 1028m-3, calculate the resistivity of the material of wire.

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When is Hα line in the emission spectrum of hydrogen atom obtained? Calculate the frequency of the photon emitted during the transition.

OR


Calculate the wavelength of radiation emitted when electron in a hydrogen atom jumps from n=∞ to n=1.


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Why is base band signal not transmitted directly? Give any two reasons.