A transistor pnp or npn can be used as a an amplifier

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69.A transistor (pnpor npn) can be used as (a)an amplifier. (b)an oscillator. (c)a switch. (d)a current source.
Q.P. Code –P 105
70.When photons each with energy 4.25 eV strike the surface of a metal A, the photoelectrons given out have maximum kinetic energy TAand the corresponding de Broglie wave length isλA. When another metal surface B is irradiated with photons each with energy 4.70 eV, the corresponding maximum kinetic energy TBis 1.50eV less thanTA. If the de Broglie wave length λBof these photoelectrons is twice that of λA, then
C
2
2
4
kg
Q.P. Code –P 10519 Rough Page
Q.P. Code –P 10520 Rough Page

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