Answer to Question #51847 in Optics for Samuel

9 Two resistances 2Ω and 3Ω are in parallel. The combination is in series with 1.5Ω resistance and a power supply of voltage V. There is a current of 3A through the 2Ω resistance. What are the values of the current I delivered by, and the voltage V across the power supply? (a) 3A and 10.5V (b) 4A and 9V (c) 4A and 12V (d) 12A and 18V
11 A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ----------- ohms to 1 place of decimal? (a)2.8Ω (b)3.2Ω (c)1.4Ω (d) 4.6Ω
14 The physical phenomenon which accounts for apparent depth of a pool of water is called? (a)waves (b) polariztion (c) diffraction (d) refraction
15 The ------------ of the eye plays an equivalent role of the screen in optical experiments? (a) lens (b) iris (c) optic nerve (d) retina