Explanation:
de – Broglie concluded his modification of Bohr’s second postulate by stating that the wavelengths of matter waves can be quantized.
This implies that the electrons can exist in those orbits which had a complete set of several wavelengths.
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Which of the following electromagnetic waves have minimum frequency
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(a) Microwaves |
(b) Audible waves |
(c) Ultrasonic waves |
(d) Radiowaves |
Assertion : In a common emitter transistor amplifier the input current is much less than the output current.
Reason : The common emitter transistor amplifier has very high input impedance.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will
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(a) Increase |
(b) Decrease |
(c) Remain constant |
(d) None of these |
The potential difference applied to an X-ray tube is 5kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is
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(a) 2 |
(b) 5 |
(c) 1 |
(d) 4 |
