8 A Phenomenon of conversion of kinetic energy into radiation. G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT:

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1 i.ne COMMON QUARTELY EXAMINATION SEPTEMBER 08 HIGHER SECONDARY SECOND YEAR KEY ANSWERS F PHYSICS Important Note :. Choose the correct answer and write the answer with option code in Section I. For Answer in Section II,III and IV like reasoning, explanation, narration, description, students may write in their own words without changing the concepts.. Answer written only in BLUE or BLACK should be evaluated. SECTION-I x = Q.NO OPTION ANSWER C Inside the sphere A ή = D C ms - B 0Ω 6 A П 7 B Increases 8 A Phenomenon of conversion of kinetic energy into radiation 9 B V A > V B > V C 0 C Frequency A.Ω D.9 x 0 A Contracts 4 D Both a) and b) D.7A i.n i.ne i.n i.ne i.n i.ne G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT:

2 i.ne Qn. No SECTION II 6X= Description Mark Total If all the point of the surface is at the same electric potential then the surface is called as the equipotential surface. The line integral B.dI for a closed curve is equal to µ 0 times the current I 0 through the area bounded by the curve. FMULA ONLY When the magnetic field through a stationary mass of metal is altered, induced current is produced in the metal. This induced current flows in the metal in the form of closed loops resembling eddies or whirl pool. Hence this current is called eddy current. e= - d/dt(nba) or equivalent formula Substitution 96V It is due to scattering of sunlight by the atmosphere. According to Rayleigh s scattering law blue light is scattering to the great extent than red light. This scattering radiation causes the sky to appear blue. E / E = l / l Substitution 0.99V i.n i.ne (i) Any discrepancy in the order of the elements in the periodic table can be removed by Moseley s law by arranging the elements according to the atomic numbers and not according to the atomic weights. ii)moseley s law has led to the discovery of new elements like hafnium (7), technetium (4), rhenium (7) etc. iii)this law has been helpful in determining the atomic number of rare earths, thereby fixing their position in the periodic table. The alignment of the dipole moment of the permanent or induced dipoles in the direction of applied electric field is called electric polarisation. e/m =.79 x 0 m =.60 x 0-9 /.79 x 0 m = 9. x 0 - kg i.n i.ne i.n i.ne G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT: Any two x +

3 i.ne V = V + V + V V = q/c, V = q/c, V = q/c /C S = /C + /C + /C Principle of potentiometer Circuit diagram E=Irl E l (or) Emf of the cell is directly proportional to its balancing length Magnetic Lorentz force Any three features (x) e= E 0 sinwt e= ir i= I 0 sinwt applied voltage and current are in phase with each other SECTION-III 6 x = 8 G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT: Properties of X-rays Any three points x F = Bqv sin θ Substitution F = 8 x 0-8 N i.n i.ne i.n i.ne i.n i.ne

4 i.ne 4 The temperature at which electrical resistivity of material suddenly drops to zero and the material changes from normal conductor to a superconductor is called the transition temperature. Change observed: i) the electrical resistivity drops to zero ii) the conductivity becomes infinity iii) the magnetic flux lines are excluded from the material. β =β/µ Substitution =.mm i.n i.ne i p r = 80 0 or r = i p sin i p /sin r = µ tan i p = µ The tangent of the polarising angle is numerically equal to the refractive index of the medium SECTION IV X= a) Gauss s law-field along straight charged wire >. Φ (or) E(πrl) Electric flux through the plane cap = 0 q = λl E is radially outward, if line charge is positive and inwards if the line charge is negative b) i) > Junction B, I I g I = 0 Junction D, I + I g I 4 = 0 For the closed network ABDA I P + I g G I R = 0 For the closed network ABCDA I P + I Q I R I 4 S = 0 For balancing condition( I g = 0) P/Q =R/S i.n i.ne G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT: i.n i.ne

5 i.ne 6 ii) > r = (( E -V)V)R substitution r= 0.0 Ω a) i) Energy stored in parallel plate capacitors is = ii) > τ = pe sinθ substitution = 8. x 0-6 Nm i.n i.ne b) > Principle Construction Working Bqv = mv /r or v/r = Bq/m = constant t =пr/v or t = пm/bq T = пm/bq = constant ʋ = /T = Bq/пm a) AC generator > Principle of four parts (mere mentioning the parts -/) Working Direction of induced current is given by Fleming right hand rule First half cycle: AB moves down, CD moves up, current in the coil DCBA and in outer circuit B -B Second half cycle: CD moves down, AB moves up, current in the coil ABCD and in outer circuit B -B i.n i.ne G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT: i.n i.ne

6 i.ne 7 e = E 0 sinwt E 0 = NBAw Output sine wave form i.n i.ne b) > i) Determination of wavelength of monochromatic light: λ = sinθ / Nm N = number of ruling per meter in the grating ii) > difference between interference and diffraction 4x = a) > Raman spectrum Definition of Raman effect for stoke s lines and anti stokes lines with respect of frequencies of Raman effect (stoke s lines, antistoke s line and unmodified frequency) ν = ν ο ν s The Raman shift does not depend upon the frequency of the incident light but it is the characteristic of the substance. For Stoke s lines, ν is positive and for Anti stoke s lines ν is negative. The intensity of Stoke s line is always greater than the corresponding Anti stoke s Line. b) > Radius of nth orbit Electrostatic force and centripetal force formula i.n i.ne G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT: i.n i.ne

7 i.ne 8 Z = i.n i.ne a) i) > Bragg s equation Construction θ- glancing angle d lattice space PE = d sinθ EQ = d sinθ Path difference = dsinθ Path difference dsinθ is equal to integral multiply of wavelength of X rays. dsinθ = nλ ii) > dsinθ max = λ max substitution λ max =.64 x 0-0 m b) > Resistor, inductor and capacitor in series ( x/) V R = IR ( phase with I) V L = IX L ( V L leads I by л/ ) V C = IX C ( V C lags behind I by л/) V L and V C 80 0 out of phase with each other and resultant of V L and V C is (V L V C ) circuit to be predominantly inductive Upto I o sin( ωt ± Φ ) is instantaneous current flowing in the circuit i.n i.ne PREPARED BY MR.G.GOBU M.Sc.,M.Phil.,B.Ed., G.H.S.S- ACHUTHAMANGALAM. THIRUVARUR-DT CONTACT NO: MAIL ID : gobusirkmu@gmail.com G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT: i.n i.ne

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9 G.GOBU,M.Sc.,M.Phil.,B.Ed., GHSS-ACHUTHAMANGALAM-TVR-DT CONTACT: i.n i.n i.n i.n w.pa i.n i.n i.n i.n i.n i.n i.n i.n i.n i.n i.n i.n i.n i.n i.n i.n w.pai.n