41.Alpha particles having kinetic energy of 1.8 MeV each are incident on a thin gold foil, form a large distance. Applying the principle of conservation of energy, find the closest distance of approach of the alpha particle from the gold nucleus.
Kinetic energy of α-particle = Potential energy of repulsion between α-particle and nucleus.
= 1264 x 10 -16
r0 = 1.264 x 10-13m
The distance of closest approach is 1.264 x 10-13 m.
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42.Calculate the minimum wavelength of X rays emitted by an X ray tube operating at a tube potential of 40 kV. How will this wavelength change if target is made of another metal ?
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43.Draw a rough sketch showing the variation of binding energy per nucleon with mass number of various nuclei. Label the graph and state the region where the nuclei are most stable.
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44.Draw a labelled circuit diagram of a N-P-N transistor in a common-emitter configuration to study its characteristics.
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45.Why is a NAND gate called a universal gate ? Show how an AND gate can be obtained using one or more NAND gates.
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46.In the circuit given below, E1 and E2 are two cells of emfs 4 V and 6 V respectively, having negligible internal resistances. Applying KirchofFs laws of electrical networks, find the values of I1 and I2.
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47.A 30 mF capacitor, 0.2 H inductor and a 50 Ω resistor are connected in series to an A.C.
source whose emf is given by E = 310 Sin (314 t) where E is in volt and t is in second. Calculate:
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