In a young's double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in phase by a multiple of: a) π/4 β ) π/2 c) 37t/4 d) t e) 27 2. the reason there are two slits, rather than one, in a young's experiment is: a) to increase the intensity b) one slit is for frequency, the other for wavelength c) to create a path length difference d) one slit is for e fields, the other is for b fields e) two slits in parallel offer less resistance 3. a stretched string, clamped at its ends, vibrates in its fundamental frequency. to one can change the string tension by a factor of: double the fundamental frequency a. 2 b. 4 c. v2 d. 1/2 1 e 4. nine identical wires, each of diameter d and length l, are connected in series. the single similar wire of length l but whose combination has the same resistance as a diameter is: a. 3d b. 9d c. d/3 d. d/9 e. d/81 5. a magnet moves inside a coil. consider the following factors: strength of the magnet ii i. number of turns in the coil speed at which the magnet moves which can affect the emf induced in the coil? iii. a) i only b) ii only c) iii only d) i and ii only e) i, ii, iii