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An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with:-

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Questions featured in Previous Year Papers on Modern Physics

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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 25

For the given circuit, the input digital signals are applied at the terminals A,B and C. What would be the output at the terminal y ?

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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 3
The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3×10-3 W will be :h=6.6×10-34 J s
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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 2
An electromagnetic wave of wavelength  λ  is incident on a photosensitive surface of negligible work function. If  m  mass is of photoelectron emitted from the surface has de-Broglie wavelength λd, then :
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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 24

Consider the following statements (A) and (B) and identify the correct answer.

(A) A Zener diode is connected in reverse bias when used as a voltage regulator.
(B) The potential barrier of p-n junction lies between 0.1 V to 0.3 V.

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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 13
A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the binding energy in the process is :
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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 23
The electron concentration in an undefined n-type semiconductor is the same as hole concentration in a undefined p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.
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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 12
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be :
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NEET Physics Express>Chapter -1 - Modern Physics>Exercise>Q 11
A radioactive nucleus AZX undergoes spontaneous decay in the sequence AZX→Z-1B→Z-3C→Z-2D, where Z is the atomic number of element X. The possible decay particles in the sequence are: