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REVISION SET- 04, , CLASS – XII, SUB – PHYSICS, , TIME – 2 Hrs., F.M. – 100, ,  All questions are compulsory : 1) Find De-Broglie wavelength of electron which is accelerated through potential V., 2) Define following terms :a) Work function, , b) Threshorld wavelength, , c) Threshorld Frequency., , 3) What is photo – Electric Effect ? Write its equation and law of photo-electric effect., 4) What is Nuclear force ? Writes its property., 5) Write down two properties and application of x-ray., 6) Write down postulates of Bohr Atomic model., 7) Write down properties and application of lazer light ., 8) Write down properties of α, β and 𝛾., 9) What will be the change in position of Atom in periodic table after Emission of 𝛼, 𝛽, particle., 10) Write down difference between intrinsic semi-conductor and extrinsic semiconductor., 11) What is Zener Diode, and why it is used as voltage regulator ?, 12) What is Diode ? and define doping ?, 13) What is transistor , and why it is used for Amplifier ?, 14) Define following terms : a) Modem, , b) Fax, , c) WWW, , d) Repeater, , e) Transducer., , 15) Write down Boolean Expression, Truth table and Symbol of Or gate and And gate., 16) What is the postulates of Ruther ford Atomic model on the basis of Bohr's Theory, explain hydrogen spectrum., Or,, Find total energy of electron which are revolving in an orbital of Atom according to, Bohr theory., 17) Define Binding energy and Binding energy per Nucleon., 18) What is P-N Junction and explain its working and structure., 19) Define Radio decay law, and half light ?, 20) Write properties of Proton., ***********************