Protected: 2014 NECO PHYSICS PRACTICAL ANS HERE NOW

(1a) Number of oscillation = 10 {NOTE: this sign ^ means Raise to power. ======================================== S/N | L(cm) | T(s) | T=t/10(s) | T^ 2(s)^2 | L(cm)^3 1. | 90.00 | 4.70 | 0.470 | 0.2209 | 729000 2. | 85.00 | 4.50 | 0.450 | 0.2025 | 614125 3. | 80.00 | 4.30 | 0.430 | 0.1849 | 512000 4. | 75.00 | 4.00 | 0.400 | 0.1600 | 421875 5. | 70.00 | 3.80 | 0.380 | 0.1444 | 343000 (Ix) Slope(s),= 720,000 - 200,000/ 0.225 - 0.11 S= 520000/0.115 S= 4521739.13cm^3/s^2 ======================================================================================== (X) PRECAUTIONS (I) I made sure rigid support of the apparatus (ii) I avoided error due to parallax when reading my stopwatch (iii) I made sure I oscillate at small angle (Iv) I minimized draught (1bi) The mas M series as an oscillator (1bii) (I) Simple pendulum bob (ii) Loaded test tube (iii) Loaded spiral spring (Iv) Skin of talking drum (V) Helical spring ======================================= (3a) E.M.F (E) = 3.00v , Io = 0.62A S/N | PJ=L(cm) | I(A) | y=E/A(v/A) | 1. | 20.00 | 0.58 | 5.172 | 2. | 30.00 | 0.50 | 6.000 | 3. | 40.00 | 0.45 | 6.667 | 4. | 50.00 | 0.40 | 7.500 | 5. | 60.00 | 0.35 | 8.571 | 6. | 70.00 | 0.32 | 9.375 | (Vii) Slope(s)= Y2 - Y1 / L2 - L1 S = 10.20 - 4.00/ 80 - 7 S = 6.20/73 S= 0.0849v/A The intercept C on the vertical axis = 2.70v/A (Viii) K = Io C K = 0.62 x 2.70 K = 1.674 ======================================= (Ix)PRECAUTIONS (I) I ensured hight connection of the wire of all the instrument use (ii) I maintained steady flow of current before taking my reading (iii) I made sure that I removed the key after each reading to avoid drained of the cell (Iv) I avoided error due to parallax on ammeter (V) I made sure that the jockey is not dragged on the wire of the potentiometer ====================================== (3bi) The key K. This is because the key serves a switch which does not drawn any current or voltage from the source of E.M.F ======================================================================================== (3b) From the defination of Resistivity P = RA/ L But A = pai D^2/ 4 P = R pai D^2/4L P4L = pai R D^2 L = pai R D^2/ 4P Where P is the resitivity of the material.