AIIMS (All India Institute of Medical Sciences) Physics: Questions 154 - 158 of 500

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If an electron and a photon propagate in the form of waves having the same wavelength, it implies that can they have the same –

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The color of a star is an indication of its [AIIMS, RPMT 1988,1989]

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A vehicle, with a horn of frequency is moving with a velocity of in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency . Then –

(Take velocity of sound in air 300 m/s)

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Consider an N – P – N transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current –

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A string in a musical instrument is 50 cm long and its fundamental frequency is 800 Hz. If a frequency of 1000 Hz is to be produced, then required length of string is –