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Dual Nature of, , kinetic energy of the particle is increased to 16 times, ibe Ke s value, the percentage change in the de-Broglie, , " of the particle is (CBSE Alpnrry, 0 " (b) 75 (©) 60 (4) $0, de-Broglie wavelength of an electron in 4th, 3 iis of Ist orbit) rcEn, f (MET CET), we (b) 4nr (c) Snr (4) 1 6eur, , ie wavelength of an clectron, rote $0 keV X-ray photon. The ratio waste of, fie photon to the kinetic energy of the clectron is, (ec energy equivalent of electron mass of 0.5 MeV), 1:30 (b) 1: 20, 20:1 () 50:1 ee, 4.Whit is the de-Broglie wavelength of the electron, secelerated through & potential difference of 100 V?, , (12.274 (b) 1.2274 IkcET], yay f(g) 0.1227A (4) 0.001227 A, i, fcr Ifthe momentum of an electron is changed by P, then the, , de-Broglie wavelength associated with it changes by 0.5%., The initial momentum of electron will be, (3) 200p (b) 400p, , “i d) 100,, Ox (d) 100p, , (Phown and electron are given same energy (10°*?J)., associated with photon and electron are 2,, and i.,, the correct statement will be {AIMS}, , (CBSE AIPMT), , hs, , yf @A,>2, (b) 2, <A., 5 @A, =A, (d) i, =e, . 1. The de-Broglie of an electrion moving with a, , wavelength, Velocity 1.5% 10° m/s is equal to that of a photon. The, Tito of the kinetic energy of the electron to the energy of, , the photon is (J&K CET), i 4 ©2 (4, oy, used in an electron microscope are accelerated, js increased to 100 kV,, If the voltage is iis the, [CBSE AIPMT), decrease by 4 times, sc dimes (incre by 2 ies, , Topic 2, Matter : de-Broglie Waves, , 9. Light of two different frequencies whose photons have, energies | V and 2.5 eV respectively, ilhuminate a metallic, surface whose work function is 0.5 eV successively. Ratio, of maximum speeds of emitted electrons will be, (ay1:2 (b)l: 1 (CBSE Arpaery, (ep i:5 (dp l:4, , 10. In photoelectric emission process from a metal of work, function 1.8 eV, the kinetic energy of most energetic, electrons is 0.5 eV. The corresponding stopping potential is, , fa i3Vv (b)0,5V (CBSE AIPMT), {c)23V (d) L8V, , 11. The de-Broglic wavelength of an electron in the ground, state of the hydrogen atom is (MHT CET), (a) we? (b) 2a, (co) ar (d) V2n0, , 12. If @ proton and an electron have the same de-Broglie, wavelength, then (Kerala CEE), (a) kinetic energy of electron < kinetic energy of proton, (b) kinetic energy of electron =kinetic energy of proton, ({c) momentum of electron > momentum of proton, (d) momentum of electron = momentum of proton, (e) momentum of electron < momentum of proton, , 13. If the particles listed below all have the same kinetic, enetgy, Which one would possess the shortest de-Broglic, , , , , , wavelength? (J&K CET), (a) Deuteron (b) a-particle, (c) Proton (d) Electron, 14. The de-Broglie wavelength ?. of an electron accelerated, through a potential V (in volts) is (J&K CET), - —=A, (c) W nm (d) W, , 15. An electron and a proton are moving in the same direction, with same kinetic energy. The ratio of the de-Broglie, wavelength associated with these particles is (J&K CET], ™, , (ob) —, ™, , Me: ee:, (a) c © f= (d) mm,, , 16. An electron of mass m, and a proton of mass m,, are, moving with the same speed. The ratio of their de-Brogtie, , wavelengths ,/2, is (KCET), (a) ; (b) 1836, , iat 918, (©7536 °

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of the smallest clectron, 107 4)m, then ition MYORER ice, (b) He* ——, (4) Be**, , ‘ of a hydrogen atom revolves, ech in acircular nth orbit of radiue., , wavelength of the first line of Lyman series, atom is equal to that of the second line of Benny, , (b) 1, , (d) 3, , tThe decreasing order of wavelength of infrared,, sscrowave, ultraviolet and gamma rays is{CBSE AIPMT], (@)gamma rays, ultraviolet, infrared, microwave, (b) microwave, gamma rays, infrared, ultraviolet, (@infrared, microwave, ultraviolet, gamma rays, (@microwave, infrared, ultraviolet, gamma rays, , 1 sgy of a hydrogen atom in the ground state is, , |. The energy of a He* ion in the first excited state, , , , , , , , ot al,, , im (CBSE AIPMT}, 3 (b)-27.2 eV, mn te (d) -6.8eV, ue fal has V atoms in its crystal structure which is a, , - close packed. Then, the number of electron, pa wes in a band is [CBSE AIPMT], , (b)2N (c)4N {oN, , , , , , , ror fa (Planck’s constant, & = 66x 10" ™ Jis), (CBSE AIPMT), , Seah, , “=, , f _ =4, then, on jumps from the orbit n =2t0 n= 4,, “rediations absorbed. will be (R is, ao (KCET, CBSE AIPMT!, 16, OR, , 3R, OT, , = Ss =., , ‘AAOMS Bnd Nuctet | 67, , 25. When helium nuclei bombard beryllium nuctei, then, (a) electrons are emitted (DUMET, CBSE AIPMT), (b) protons are emitted, (c) neutrons are emitted, (d) protons and neutrons are emitted, , 26. In an inelastic collision an electron excites a hydrogen atom, from its ground state to a M-shell state. A second electron, collides instantaneously with the excited hydrogen atom in, the M-shell state and ionizes it. At least how much, the second electron transfers to the atom in the M-shell, state? (WB JER}, , (a)+34eV (b)+ LS1eV(c)-34eV (d)- i siev, , 27. According to the Bobr's atomic model, the relation, between principal quantum number (n ) and radius of orbit, , (ris (J&K CET), , (a) ren? (br @re! (ran, n ", , 28. Rutherford’s atomic model could account for (KCET}, , (a) stability of atoms, , (b) origin of spectra, , (c) the positive charged central core of an atom, , (d) concept of stationary orbits, , 29, The thermonuclear reaction of hydrogen inside the stars is, taking place by a cycle of operations. The particular, , clement which acts as a catalyst is (KCET), (a) nitrogen (b) oxygen, (c) helium (d) carbon, , 30. Ina Rutherford scattering experiment when a projectile of, charge Z, and mass M, approaches a target nucleus of, charge Z, and mass M ,, the distance to closest approach is, ‘. The energy of the projectile is (CBSE AIPMT), (a) directly proportional to M, = M >, (b) directly proportional to Z, Z,, , ‘(¢) directly proportional to Z,, (d) directly proportional to mass M,, , 31. The ionization energy of the electron in the hydrogen atom, in its ground state is 13.6 eV. The atoms are excited to, higher energy levels to emits radiations of 6 wavelengths., Maximum wavelength of emitted radiation corresponds to, the transition between (CBSE AIPMT!, (a)n=3andn=2states —(b) n= 3and n =| state, (c) a =2and n =I state (d) m= 4 and m = 3 states, , 32, An electron jumps from the 4th obit w 2nd ort of ie, , atom. Given, Rydberg’s constant & = ’, re temaony i here of ened ada wil be TAFMCI, , 3 Boot 2 x10? @oxte®, (a) 710° (o) 55x10" © 5,r10 @7

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712 | Chapterwise & Topicwise Medical Entrances Solved Papers, , 2008, with » band gap of, SLA -n photostiode is made of a material, SO cv. The miniemam frequency of the radiation that can be, absorbed by the muterial is nearly (OMSK APT), (a) 10 10"* He (b) S= 10" He, () tx 10" He (d) 20 10" Hz, , 34, If in a p-n junction diode, a square input signal of 10 V is, applied as shown below., , sv,, , , , -5V, Then the output signal across R, will be, , 10V, (a) I (b) I, ~10V, {d), , © ey, i? oe, , 3S. Assertion (A) The value of current through p-n junction, in the given figure will be 10 mA, zi, , +5¥ MOQ > +2V, , Reason (R) In the above figure, p-side is at higher, , potential then n-side, [AIIMS}, , (a) Both A and R are correct and R is the correct, ion of A., , 1ALIMS}, , (b) Both A and R are correct but R is not the correct, explanation of A., (c) A is correct but R is incorrect., (d) A is incorrect but R is correct., 36. In an unbiased p-n junction,, , (a) potential at p is more than that at n, (®) potential at p is less than that at n, (c) potential at p is equal to that at m, (4) potential at p is positive and that at n is negative, 37. In the given circuit, the current through the resistor of, 2kQ is (Kerala CEE}, Tho, , (KCET], , , , , , (a)2mA—(b) 4 mA, , fa (© 6mA — @ ma, , , , , , , , , , , , , , 38. In the middle of the depletion layer of, P-n junction, the, (a) electric field is zero, (b) potential is maximum, () electric field is maximum, (d) potential is zero, , 39. When a p-n junction diode is, barrier potential, , (a) decreases and less Current flows in the rout, (b) decreases and more current flows in the cireyit, (c) increases and more Surrent flows in the cin ait, , (4) decreases and no current flows in the circuit, , 40. The main cause of zener breakdown is Jax, , {a) the base semiconductor being germanium, (b) production of electron-hole pairs due to ther, excitation ;, , (c) low doping, (d) high doping, 41. The depletion layer in a silicon diode is | uum wide and §, , knee voltage is 0.6 V, then the electric field in the deps, layer will be, , reverse, t, , Connected in forward bias 7, (Jak, , (Jax, (a) 0.6 Vm" (b) 6x 10* Vm, (c) 6x 10° Vm"! (d) zero, , 42. Zener diode acts as ID, , (a) voltage regulator in reverse biasing, , (b) voltage regulator in forward biasing, , (c) current regulator in reverse biasing, , (4) current regulator in forward biasing, 43, Assertion (A) Light Emitting Diode (LED), , Spontaneous radiation., , Reason (R) LED are forward biased p-n junctions., , (a) Both A and R are correct and R is the co, explanation of A, (b) Both A and R are correct but R is not the co, explanation of A, (c) A is correct but R is incorrect, (d) A is incorrect but R is correct, 44. Barrier potential of a p-n junction diode does not, on, (a) forward bias (b) doping density, (c) diode design (d) temperature, 4S. If a full-wave rectifier, circuit is operating from $0, mains, the fundamental frequency in the ripple will be, , (a) 70.7 Hz (b) 100 Hz (MHT, (c) 25 Hz (d) 59 Hz, , 46. In a diode, when there is a saturation current, the p!, resistance will be (MET, (a) data insufficient (b) zero, (c) finite quantity (d) infinite quantity